conflicting versions of jquery:
<script src="http://code.jquery.com/jquery-1.10.2.min.js"></script>
this one is added by form builder:
<script src="//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
<script src="//ajax.googleapis.com/ajax/libs/jqueryui/1/jquery-ui.min.js"></script>
try the same form on a blank page, you should not see the same problem.