Maximizing window not working

Some weeks ago (I think it was February) Manjaro update messed my settings and since then I can’t maximize windows (or maximise how it is named in shortcuts). First I thought that’s because of Krohnkite script; I don’t have window decorations and I use meta+w for going max, but when I turned decorations on, I discovered that clicking button for maximizing doesn’t do anything either. What happens is window blinks for a fraction of second, like it want to go max, but decides “nah, I’ll stay here”.
Anyone have any idea what’s wrong? My oldest timeshift snapshot is from 15th February, but I really don’t want to replace everything becasue a lot of things happened since then, but maybe I could check some old files but I don’t even know where to look for it.

Does this also happen if you create a new user and log in there? (E.G. eleuth2)