FixedColumn messes line alignment

Hello!

I'm new to DataTables and I'm trying to create a table with 2 fixed columns and fixed headers.
I'm using DataTables version 1.9.4.

When I use the fixedcoluns, the line aligment gets all messed up in IE. Chrome and Firefox are doing just fine.
Anyone has seen it before?

That's my js:

<script type="text/javascript">
	jQuery(document).ready( function () {
 	var oTable = jQuery("#testmatrix").dataTable({
  		"sScrollX": "100%",
  		"sScrollXInner": "440%",
 		"sScrollY": "550",
  		"sDom": "t",
  		"bScrollCollapse": true,
		"bPaginate": false,
		"bSort": false,
		"bAutoWidth": false
});

var oFC = new FixedColumns( oTable, {
 		"iLeftColumns": 2,
		"iLeftWidth": 200,
		"sHeightMatch": "semiauto"
		
 	} );
	
} );
 
 
</script>

Thanks in advance!