Hi forensys
As I can see their plugin is even loading old version 1.10.1of jquery. In this file:
/plugins/vmpayment/paylike/paylike.php
I replaced:
$document->addScript( 'https://ajax.googleapis.com/ajax/libs/jquery/1.10.1/jquery.min.js' );
by:
JHtml::_('jquery.framework');
A good extension should not have such bad code and loading Bootstrap for a plugin??? instead of blaming template, they should check their code first.
I updated above code and it should work fine now on your site, kindly check.