Multiselect - unselect (scrollbar gets blocked)

How Do I...
#1

Hi, I have problem with multiselect. When I unselect a selected record, the scrollbar gets blocked. Could you please advise me a solution to this problem? My implementation is:

$(’.AllSelect2CboHasThisClass’).each(function () {
$(this).select2({
dropdownParent: dropdownParents,
placeholder: xyxyxy
}).on(“select2:unselect”, function (e) {
call ajax and refresh cbo
});

thanks