Android CollapsingToolbarLayout не должен отображать панель инструментов, закрепленную сверху

Попробуй так

    <android.support.design.widget.AppBarLayout
        android:fitsSystemWindows = "true">

        <android.support.design.widget.CollapsingToolbarLayout
            app:layout_scrollFlags = "scroll|exitUntilCollapsed">

            <ImageView app:layout_collapseMode = "parallax" />

            <android.support.v7.widget.Toolbar       
                app:layout_collapseMode = "pin"
                app:layout_scrollFlags = "scroll|enterAlways" />

        </android.support.design.widget.CollapsingToolbarLayout>

    </android.support.design.widget.AppBarLayout>

Это происходит из-за того, что на вашем CollapsingToolbarLayout не используется какой-либо кричащий цвет. Это должно быть так:

   <android.support.design.widget.AppBarLayout
    android:id = "@+id/app_bar_layout"
    android:layout_width = "match_parent"
    android:layout_height = "wrap_content"
    android:theme = "@style/ThemeOverlay.AppCompat.Dark.ActionBar"
    android:fitsSystemWindows = "true">

    <android.support.design.widget.CollapsingToolbarLayout
        android:id = "@+id/collapsing_toolbar"
        android:layout_width = "match_parent"
        android:layout_height = "match_parent"
        app:layout_scrollFlags = "scroll|exitUntilCollapsed"
        app:contentScrim = "?attr/colorPrimary"
        app:expandedTitleMarginStart = "48dp"
        app:expandedTitleMarginEnd = "64dp"
        android:fitsSystemWindows = "true"
        >

        <ImageView
            android:id = "@+id/image"
            android:layout_width = "match_parent"
            android:layout_height = "match_parent"
            android:scaleType = "fitXY"
            android:fitsSystemWindows = "true"
            app:layout_collapseMode = "parallax"
            android:src = "@drawable/picture1"
            />

        <android.support.v7.widget.Toolbar
            android:id = "@+id/toolbar"
            android:layout_width = "match_parent"
            android:layout_height = "?attr/actionBarSize"
            app:popupTheme = "@style/ThemeOverlay.AppCompat.Light"
            app:layout_collapseMode = "pin"
            />

    </android.support.design.widget.CollapsingToolbarLayout>

</android.support.design.widget.AppBarLayout>