Datatable, таблица перекрывается при использовании фиксированного столбца

$(document).ready(function() {
    var table = $('#example').DataTable( {
        scrollY:        "300px",
        scrollX:        true,
        scrollCollapse: true,
        paging:         false,
        fixedColumns:   {
            leftColumns: 2
        }
    } );
} );

/* Ensure that the demo table scrolls */
    th, td { white-space: nowrap; }
    div.dataTables_wrapper {
        width: 800px;
        margin: 0 auto;
    }

<script src = "https://cdn.datatables.net/fixedcolumns/3.2.6/js/dataTables.fixedColumns.min.js"></script>
<script src = "https://cdnjs.cloudflare.com/ajax/libs/datatables/1.10.19/js/jquery.dataTables.min.js"></script>
<script src = "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<link href = "https://cdn.datatables.net/1.10.19/css/jquery.dataTables.min.csshttps://cdn.datatables.net/fixedcolumns/3.2.6/css/fixedColumns.dataTables.min.css" rel = "stylesheet"/>
<link href = "https://cdn.datatables.net/1.10.19/css/jquery.dataTables.min.css" rel = "stylesheet"/>
<script src = "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<table id = "example" class = "stripe row-border order-column" style = "width:100%">
    <thead>
        <tr>
            <th>First name</th>
            <th>Last name</th>
            <th>Position</th>
            <th>Office</th>
            <th>Age</th>
            <th>Start date</th>
            <th>Salary</th>
            <th>Extn.</th>
            <th>E-mail</th>
        </tr>
    </thead>
    <tbody>
        <tr>
            <td>Tiger</td>
            <td>Nixon</td>
            <td>System Architect</td>
            <td>Edinburgh</td>
            <td>61</td>
            <td>2011/04/25</td>
            <td>$320,800</td>
            <td>5421</td>
            <td>[email protected]</td>
        </tr>
        <tr>
            <td>Garrett</td>
            <td>Winters</td>
            <td>Accountant</td>
            <td>Tokyo</td>
            <td>63</td>
            <td>2011/07/25</td>
            <td>$170,750</td>
            <td>8422</td>
            <td>[email protected]</td>
        </tr>
        <tr>
            <td>Ashton</td>
            <td>Cox</td>
            <td>Junior Technical Author</td>
            <td>San Francisco</td>
            <td>66</td>
            <td>2009/01/12</td>
            <td>$86,000</td>
            <td>1562</td>
            <td>[email protected]</td>
        </tr>
        <tr>
            <td>Cedric</td>
            <td>Kelly</td>
            <td>Senior Javascript Developer</td>
            <td>Edinburgh</td>
            <td>22</td>
            <td>2012/03/29</td>
            <td>$433,060</td>
            <td>6224</td>
            <td>[email protected]</td>
        </tr>
    </tbody>
</table>