ScrollY expanding the table when typing on Search box

Wahib_Idris

ScrollY is causing that behaviour with expanding the table on each keypress in Search. Does anyone have an idea what could be the possible reason. I want my header to be fixed. Below is my code snippet

var j$ = jQuery.noConflict();
        j$('table.dataTable').dataTable({
            sPaginationType: "full_numbers",
            iDisplayLength: ('{!showComponent}'=='Customer Profile') ? 200 : 2000,
            "scrollY":        "200px",
            "paging": false
        });