Can't expand topics anymore

Hello there

Since last week I'm unable to expand or collapse all my topics anymore on my Map. I didnt change anything as far as I know when I last edited the map. Also open an older Version of the map dont solve the problem as well as switching the Computer or Browser (tried Safari / Chrome / Firefox / Brave).

Whats wrong with my map? Did I somehow lock all the topics? When I open the map in the editor, i can expand/collapse as usual, but not when published and opened in a browser.

Here's the map: https://share.mindmanager.com/#publish/WSmbL2K1dH9TvyeRrKRA_iP61XQfyGVUDr-Enu2A

Simon