You load jquery twice (Remove the jquery CDN from your code). Webflow sites already have jquery included
Must of the time loading jquery twice will cause bugs.
Change this and tell if the problem solve.
Anyway its hard to solve this without the plugin API - you also can open a ticket on codecanyon
1:
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
2:
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.2.0/jquery.min.js" type="text/javascript"></script>
Related Q:
- put the code in the “before body tag” area:
Custom code in head and body tags - Webflow University Documentation
OUT OF TOPIC:
Check in the API how to play one song only in same time (If the user play song1 - than click on song2 - song1 should stop, otherwise you get loud mix song)
See docs example: Light Music and Radio Player Preview - CodeCanyon