What I find most unusual is that it also affects administrators. When I wrote Configuring automatic post review triggers, they were always excluded.
I didn’t notice something like that, and the group names in my forum are German. Is there anything special about the Finnish names of “admins” and “moderators”? Any special characters?
I assume you would have mentioned it, but is there a reason shown in the review queue?
I don’t think safe mode is much help as it’s not your browser that adds the post for review and safe mode doesn’t disable backend code.
I think Geoblocking had recent changes that might fit to when this issue occured for you.