Мерцание в верхней части экрана переработчика

Я вижу мерцание в моем представлении переработчика прямо вверху. Мерцание, похоже, напоминает верхние строки моих рисуемых фигур в файле item.xml представления recycler. Я внес различные коррективы в линии и другие вещи, чтобы увидеть, смогу ли я предотвратить мерцание, но, похоже, ничего не работает.

Вот мой код;

Активность

<?xml version = "1.0" encoding = "utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android = "http://schemas.android.com/apk/res/android"
    xmlns:app = "http://schemas.android.com/apk/res-auto"
    xmlns:tools = "http://schemas.android.com/tools"
    android:layout_width = "match_parent"
    android:layout_height = "wrap_content"
    tools:context = ".ScoreHistory">

    <TextView
        android:id = "@+id/textView_history_title"
        android:layout_width = "match_parent"
        android:layout_height = "60dp"
        android:layout_marginStart = "16dp"
        android:layout_marginTop = "16dp"
        android:layout_marginEnd = "16dp"
        android:gravity = "center|center_horizontal|center_vertical"
        android:padding = "5dp"
        android:text = "@string/GameHistory_Title"
        android:textAlignment = "gravity"
        android:textColor = "@color/lime"
        android:textStyle = "bold"
        app:autoSizeTextType = "uniform"
        app:layout_constraintEnd_toEndOf = "parent"
        app:layout_constraintStart_toStartOf = "parent"
        app:layout_constraintTop_toTopOf = "parent" />

    <androidx.recyclerview.widget.RecyclerView
        android:id = "@+id/RV_scorehistory"
        android:layout_width = "match_parent"
        android:layout_height = "wrap_content"
        app:layout_constraintEnd_toEndOf = "parent"
        app:layout_constraintStart_toStartOf = "parent"
        app:layout_constraintTop_toBottomOf = "@+id/textView_history_title" />


</androidx.constraintlayout.widget.ConstraintLayout>

Мой товар.xml

<?xml version = "1.0" encoding = "utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android = "http://schemas.android.com/apk/res/android"
    xmlns:app = "http://schemas.android.com/apk/res-auto"
    xmlns:tools = "http://schemas.android.com/tools"
    android:layout_width = "match_parent"
    android:layout_height = "55dp"
    android:layout_marginLeft = "5dp"
    android:layout_marginRight = "5dp"
    android:background = "@drawable/rv_lines"
    android:gravity = "center_vertical">

    <TextView
        android:id = "@+id/TV_RV_ID"
        android:layout_width = "0dp"
        android:layout_height = "match_parent"
        android:layout_margin = "0dp"
        android:gravity = "center"
        android:textAlignment = "center"
        app:layout_constraintEnd_toStartOf = "@+id/TV_RV_DIFFICULTY"
        app:layout_constraintHorizontal_bias = "0.5"
        app:layout_constraintHorizontal_weight = "1"
        app:layout_constraintStart_toStartOf = "parent"
        app:layout_constraintTop_toTopOf = "parent" />

    <TextView
        android:id = "@+id/TV_RV_DIFFICULTY"
        android:layout_width = "0dp"
        android:layout_height = "match_parent"
        android:layout_marginStart = "2dp"
        android:gravity = "center"
        android:textAlignment = "center"
        app:layout_constraintBaseline_toBaselineOf = "@+id/TV_RV_ID"
        app:layout_constraintEnd_toStartOf = "@+id/TV_RV_SUMTYPE"
        app:layout_constraintHorizontal_bias = "0.5"
        app:layout_constraintHorizontal_weight = "4"
        app:layout_constraintStart_toEndOf = "@+id/TV_RV_ID" />

    <TextView
        android:id = "@+id/TV_RV_SUMTYPE"
        android:layout_width = "0dp"
        android:layout_height = "match_parent"
        android:layout_marginStart = "2dp"
        android:gravity = "center"
        android:textAlignment = "center"
        app:layout_constraintBaseline_toBaselineOf = "@+id/TV_RV_DIFFICULTY"
        app:layout_constraintEnd_toStartOf = "@+id/TV_RV_OutOfText"
        app:layout_constraintHorizontal_bias = "0.5"
        app:layout_constraintHorizontal_weight = "3.5"
        app:layout_constraintStart_toEndOf = "@+id/TV_RV_DIFFICULTY" />

    <TextView
        android:id = "@+id/TV_RV_OutOfText"
        android:layout_width = "0dp"
        android:layout_height = "match_parent"
        android:layout_marginStart = "2dp"
        android:gravity = "center"
        android:text = "@string/score_text"
        app:layout_constraintBaseline_toBaselineOf = "@+id/TV_RV_SUMTYPE"
        app:layout_constraintEnd_toStartOf = "@+id/TV_RV_SCORE"
        app:layout_constraintHorizontal_bias = "0.5"
        app:layout_constraintHorizontal_weight = "2"
        app:layout_constraintStart_toEndOf = "@+id/TV_RV_SUMTYPE" />

    <TextView
        android:id = "@+id/TV_RV_SCORE"
        android:layout_width = "0dp"
        android:layout_height = "match_parent"
        android:layout_marginStart = "6dp"
        android:gravity = "center"
        android:textAlignment = "center"
        android:textStyle = "bold"
        app:layout_constraintBaseline_toBaselineOf = "@+id/TV_RV_OutOfText"
        app:layout_constraintEnd_toStartOf = "@+id/TV_RV_QCOUNT_TEXT"
        app:layout_constraintHorizontal_bias = "0.5"
        app:layout_constraintHorizontal_weight = "1.5"
        app:layout_constraintStart_toEndOf = "@+id/TV_RV_OutOfText" />

    <TextView
        android:id = "@+id/TV_RV_QCOUNT_TEXT"
        android:layout_width = "0dp"
        android:layout_height = "match_parent"
        android:layout_marginStart = "2dp"
        android:gravity = "center"
        android:text = "@string/questions_text"
        android:textAlignment = "gravity"
        android:textStyle = "bold"
        app:layout_constraintBaseline_toBaselineOf = "@+id/TV_RV_SCORE"
        app:layout_constraintEnd_toStartOf = "@+id/TV_RV_QCOUNT"
        app:layout_constraintHorizontal_bias = "0.5"
        app:layout_constraintHorizontal_weight = ".75"
        app:layout_constraintStart_toEndOf = "@+id/TV_RV_SCORE" />

    <TextView
        android:id = "@+id/TV_RV_QCOUNT"
        android:layout_width = "0dp"
        android:layout_height = "match_parent"
        android:layout_marginStart = "2dp"
        android:background = "@drawable/target_icon"
        android:gravity = "center"
        android:textAlignment = "center"
        android:textStyle = "bold"
        app:layout_constraintBaseline_toBaselineOf = "@+id/TV_RV_QCOUNT_TEXT"
        app:layout_constraintEnd_toEndOf = "parent"
        app:layout_constraintHorizontal_bias = "0.5"
        app:layout_constraintHorizontal_weight = "1.5"
        app:layout_constraintStart_toEndOf = "@+id/TV_RV_QCOUNT_TEXT" />
</androidx.constraintlayout.widget.ConstraintLayout>

Я устанавливаю фоновые ресурсы здесь, в моем адаптере

class ScoreHistoryAdaptor : ListAdapter<SavedScores, ScoreHistoryAdaptor.SavedScoreViewHolder>(WordsComparator()) {

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): SavedScoreViewHolder {
        return SavedScoreViewHolder.create(parent)
    }

    override fun onBindViewHolder(holder: SavedScoreViewHolder, position: Int) {
        val current = getItem(position)
        holder.bind(current.id,current.difficulty,current.sumtype,current.questioncount,current.answeredcorrectly)
    }

    class SavedScoreViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
        private val IDItemView: TextView = itemView.findViewById(R.id.TV_RV_ID)
        private val DiffultyItemView: TextView = itemView.findViewById(R.id.TV_RV_DIFFICULTY)
        private val SumTypeItemView: TextView = itemView.findViewById(R.id.TV_RV_SUMTYPE)
        private val qCountItemView: TextView = itemView.findViewById(R.id.TV_RV_QCOUNT)
        private val ScoreItemView: TextView = itemView.findViewById(R.id.TV_RV_SCORE)
        private var DIFFCODE = ""
        private var SUMTYPECODE = ""
        val myContext = SumTypeItemView.context
        fun bind(ID: Int?,DIFFICULTY:String?,SUMTYPE:String?,QC:Int?,SCORE:Int?) {
            IDItemView.text = ID.toString()
            when (DIFFICULTY) {
                myContext.resources.getString(R.string.diffLVL1) -> {DIFFCODE = DIFFICULTY; DiffultyItemView.setBackgroundResource(R.drawable.diff_easy_icon)}
                myContext.resources.getString(R.string.diffLVL2) -> {DIFFCODE = DIFFICULTY ; DiffultyItemView.setBackgroundResource(R.drawable.diff_normal_icon)}
                myContext.resources.getString(R.string.diffLVL3) -> {DIFFCODE = DIFFICULTY; DiffultyItemView.setBackgroundResource(R.drawable.diff_hard_icon) }
                myContext.resources.getString(R.string.diffLVL4) -> {DIFFCODE = DIFFICULTY ; DiffultyItemView.setBackgroundResource(R.drawable.diff_impossible_icon)}
                myContext.resources.getString(R.string.random) -> {DIFFCODE = DIFFICULTY ; DiffultyItemView.setBackgroundResource(R.drawable.diff_random_icon)}
            }

            DiffultyItemView.text = DIFFCODE
            when (SUMTYPE) {
                myContext.resources.getString(R.string.catMulti) -> {SUMTYPECODE = myContext.resources.getString(R.string.multi_symbol) }
                myContext.resources.getString(R.string.catAdd) -> {SUMTYPECODE = myContext.resources.getString(R.string.add_symbol)}
                myContext.resources.getString(R.string.catSub) -> {SUMTYPECODE = myContext.resources.getString(R.string.sub_symbol)}
                myContext.resources.getString(R.string.catDiv) -> {SUMTYPECODE = myContext.resources.getString(R.string.div_symbol)}
                myContext.resources.getString(R.string.catSqrR) -> {SUMTYPECODE = myContext.resources.getString(R.string.sqr_symbol) + "n"}
                myContext.resources.getString(R.string.catSqrD) -> {SUMTYPECODE = "n" + myContext.resources.getString(R.string.sqrd_symbol)}
                myContext.resources.getString(R.string.catCubeR) -> {SUMTYPECODE = myContext.resources.getString(R.string.cuber_symbol) + "n"}
                myContext.resources.getString(R.string.catCubeD) -> {SUMTYPECODE = "n" + myContext.resources.getString(R.string.cubed_symbol)}
                myContext.resources.getString(R.string.random) -> {SUMTYPECODE = myContext.resources.getString(R.string.random)}
            }
            when (IsScoreLessThanTarget(SCORE!!.toInt(),QC!!.toInt())){
                true ->{ScoreItemView.setBackgroundResource(R.drawable.somewrong_icon)}
                false ->{ScoreItemView.setBackgroundResource(R.drawable.allcorrect_icon)}
            }
            SumTypeItemView.setBackgroundResource(R.drawable.sumtype_icon)
            SumTypeItemView.text = SUMTYPECODE
            qCountItemView.text = QC.toString()
            ScoreItemView.text = SCORE.toString()
        }



        companion object {
            fun create(parent: ViewGroup): SavedScoreViewHolder {
                val view: View = LayoutInflater.from(parent.context)
                    .inflate(R.layout.row_item, parent, false)
                return SavedScoreViewHolder(view)
            }
        }
    }

    class WordsComparator : DiffUtil.ItemCallback<SavedScores>() {
        override fun areItemsTheSame(oldItem: SavedScores, newItem: SavedScores): Boolean {
            return oldItem.id == newItem.id
        }

        override fun areContentsTheSame(oldItem: SavedScores, newItem: SavedScores): Boolean {
            return oldItem == newItem
        }
    }
}
private fun IsScoreLessThanTarget(score:Int,target:Int): Boolean{
    return score < target
}

В другом представлении с использованием прокрутки я получаю то же самое