Problem With Clonable MetaBox In FrontEnd

Hello,

I have a problem with conable metaboxes on my site, I use learnpress to give online courses and its “frontend editor” extension for my trainers to create their courses on the frontend of the site.

There is a clonable metabox where they can insert “what comes with the course”, this metabox works fine for me in the backend but on the slingshot the “add more” and “delete” button doesn’t work!

Maybe it’s a script loading problem but I’m not sure, I searched all day and updated my plugin but nothing works!

You can see in the photos below:

Backend: https://ibb.co/yg272wn
Frontend: https://ibb.co/Lrdp3FN

I’m posting here because I think you can help me ??
(you have to be a trainer to access the page where the problem appears but I can create a dedicated access for you if you want)

Thank you very much in advance !

The page I need help with: [log in to see the link]