Multisite templates mixed

Hi guys,

Suddenly the templates of one of my multiste appeared in another multiste and vice versa (the third multisite looks good). When I delete any template group, it is also deleted on the second multisite (the same when I add a new one). After refreshing, deleted groups appear again.

“Save_tmpl_files” is set as default.

Why did it happen suddenly? Is this a problem with access rights? What could have changed?

Thanks.