Ok now it's ok for the playlist, the second issue is you have another instance of jwplayer who is load in the html head of your webpage :
Code:
<script src="/h/plugins/content/jw_allvideos/jw_allvideos/includes/js/mediaplayer/jwplayer.min.js?v=4.5.0" type="text/javascript"></script>
this is a deprecated version of jwplayer (5.x version) who made a conflict with the JWplayer 6.x (the version we use), please unload this (I guess this come from the extension allvideos)