Column Sizing

Hi

When I go to my page with my Datatable I got this rare column Sizing:
http://s2.postimg.org/kjguobco9/datatable.jpg

But when I click on some header, the column sizing is normal...

Can someone help me?

This is my code:

        setTimeout( function () { oTable.fnAdjustColumnSizing(); }, 10 );
        var oTable = $('#dossierOverzicht').dataTable({
            "sDom": "<'row'<'span6'l><'span6'f>r>t<'row'<'span6'i><'span6'p>>",
          "sScrollX": "90%",
          "sScrollXInner": "140%",
          "bScrollCollapse": true
        });

        $(window).resize(function() {
            oTable.fnDraw(false)
        });
        $('#dossierOverzicht_nav').on('click', 'li input', function() {
            fnShowHide($(this).val(), oTable);
        });