[jQuery] event is fired every other time after using jQuery's sortable plugin

[jQuery] event is fired every other time after using jQuery's sortable plugin


I have the following code in a page. everything related to sorting is
working well. Each item has a textarea and this textarea has onkeyup
event handler. This event handler will only fire every other time.
Does anyone know why this is happening? Thanks.
$('table.pane').each(function(){
if (this.id) {
$(this).sortable({items:"tr.tsdnd", update:saveLists});
}
});