There is a bug on WordPress Page Template Plugin that I have recently discovered. In the plugin, there is a JS file dependent on Jquery. But when it is enqueued in the WordPress, it was not stated dependency on Jquery so it results in loading before jquery if jquery is not enqueued before. As a result of that, it generates error in browser console and causes js clashes and conflicts. I hope this bug fix helps other people who are also having the same problem and the author of the plugin considers this in the future update.
Replace this
wp_enqueue_script('pgt-helper', WP_PLUGIN_URL . '/' . basename(dirname(__FILE__)) . '/scripts/functions.js');
wp_enqueue_script('pgt-ajax', WP_PLUGIN_URL . '/' . basename(dirname(__FILE__)) . '/scripts/ajax.js');
wp_enqueue_script('pgt-box-placement', WP_PLUGIN_URL . '/' . basename(dirname(__FILE__)) . '/scripts/box-placement.js');
wp_enqueue_style('pgt-style-admin', WP_PLUGIN_URL . '/' . basename(dirname(__FILE__)) . '/css/style.admin.css');
with
wp_enqueue_script('pgt-helper', WP_PLUGIN_URL . '/' . basename(dirname(__FILE__)) . '/scripts/functions.js');
wp_enqueue_script('pgt-ajax', WP_PLUGIN_URL . '/' . basename(dirname(__FILE__)) . '/scripts/ajax.js');
wp_enqueue_script('pgt-box-placement', WP_PLUGIN_URL . '/' . basename(dirname(__FILE__)) . '/scripts/box-placement.js', array('jquery'));
wp_enqueue_style('pgt-style-admin', WP_PLUGIN_URL . '/' . basename(dirname(__FILE__)) . '/css/style.admin.css');