I seem to be having a similar issue. I have tried locating this string <script> but with no luck as my theme seems to have a few of them. I have tried deleting these items but then ruins other aspects of my site.
https://www.enphasetraining.com
I use to be able to use this aspect before I switched to a different page template and now the sorting feature which is what im trying to get working wont work on this template.
any help on this would be greatly appreciated.
Thanks
Regards,