Debugging JS errors

I'm struggling with this error and would appreciate some help.

Wordpress with the MasterStudy theme and then MasterStudy LMS plugin. Elementor on top. Everything up to date. I have a caching plugin, but it's deactivated. Cloudflare on top.

https://www.swingdancehome.com/en/all-courses/solo-jazz-english-spanish/

When I click on Curriculum I should see all the classes. Equally, when going back to Overview the content disappears as well.

I'm not an experienced coder yet, so struggling how I could fix this. I do see erros in the LMS plugin in the console though.

Any help or steps how to figure this out would be very welcome.

Thank you.