Thanks for contacting us and choosing our product!
I have just checked your site and see the issue.
However I checked our dev site and our demo site all working fine.
Did you customize anything? Maybe it will help us find the reason more quickly!
Can you send us your site FTP account via email firstname.lastname@example.org. We need it to debug code on your site.
Thanks for your reply! As I replied in email.
After checking your site and debug js code.
We can’t found any issue from our code.
However I have just checked your site again and see maybe you enable mod_pagespeed on your site and it can cause this issue: http://prntscr.com/ifysjz
Can you please disable it then recheck again. To optimize js and css on your site you can use AutoOptimize plugin.
Hope this help you!