Fixed Columns question

Hi,
I am trying to implement fixed columns on a datatable but am getting some formatting issues. I am using the latest versions of everything but am getting a scrollbar under my fixed columns ( 2 scrollbars appearing at the bottom) and the header is slightly out as well.

Anyone any ideas why this is? I have followed the documentation from what I can see.

Code is as follows:-

$(document).ready(function () { var table = $('#myTable').dataTable({ "scrollX": "100%", }); new $.fn.dataTable.FixedColumns( table, {"leftColumns": 2} ); });

Thanks