Can't enable/delete themes throughout network

My agency uses WordPress as a CMS for multiple users on the same installation. We install new themes as network admins and this has worked fine so far until today, with no apparant reason, all themes reverted back to inactive throughout the entire network. When I try and enable them networkwide it says “24 themes active” but in the list of themes they are still shown as disabled.

The themes are still working on the sites themselves, but I can’t change them or add a new theme to a new blog as an admin. It says “activate themes for this blog first”. I have tried enabling them all at once and singular but nothing works.

Thanks for any help.

Edit. Apparently I can’t delete any themes either.