fixes #8232

js/dropdown.js

@@ -42,7 +42,7 @@
     if (!isActive) {
       if ('ontouchstart' in document.documentElement) {
         // if mobile we we use a backdrop because click events don't delegate
-        $('<div class="dropdown-backdrop"/>').insertBefore($(this)).on('click', clearMenus)
+        $('<div class="dropdown-backdrop"/>').insertAfter($(this)).on('click', clearMenus)
       }
 
       $parent.trigger(e = $.Event('show.bs.dropdown'))