Sorting works in preview, not in browser

Good day!

I’m currently following the getting started videos and I have a small problem.

I created a sortable table, which works fine in the preview mode, I can click on the sorting icons and it works.

Screenshot 2021-07-28 at 13.34.493832×2366 766 KB

When I load it in the browser it shows the table but the sorting is not-clickable:

Screenshot 2021-07-28 at 13.35.163224×1998 367 KB

I saved everything, I restarted all services, restarted docker etc but nothing seems to work.
I searched in the community but couldn’t find another topic about this.
What am I missing?

Thank you for your help!