Plugin scripts removed after sending form

When you submit the form and it’s not a success, the page is reloaded with the errors and this following scripts are removed, and the conditional fields doesn’t works.

<script type=’text/javascript’ src=’http://localhost:8888/wordpress/wp-includes/js/jquery/jquery.js?ver=1.12.4′></script&gt;
<script type=’text/javascript’ src=’http://localhost:8888/wordpress/wp-includes/js/jquery/jquery-migrate.min.js?ver=1.4.1′></script&gt;
<script type=’text/javascript’ src=’http://localhost:8888/wordpress/wp-content/plugins/cf7-conditional-fields/js/scripts.js?ver=1.3.4′></script&gt;

Anyone knows how to fix this?