Forgot the css.

core/css/jquery.multiselect.css

@@ -11,7 +11,7 @@
 .ui-multiselect-header span.ui-icon { float:left }
 .ui-multiselect-header li.ui-multiselect-close { float:right; text-align:right; padding-right:0 }
 
-.ui-multiselect-menu { display:none; padding:3px; position:absolute; z-index:10000 }
+.ui-multiselect-menu { display:none; padding:3px; position:absolute; z-index:10000; text-align: left }
 .ui-multiselect-checkboxes { position:relative /* fixes bug in IE6/7 */; overflow-y:scroll }
 .ui-multiselect-checkboxes label { cursor:default; display:block; border:1px solid transparent; padding:3px 1px }
 .ui-multiselect-checkboxes label input { position:relative; top:1px }