Bug, please help.

Hello. Help me please. I ran into a problem, I can’t talk to some NPCs, some of them are merchants, the talk button just doesn’t appear. In addition to merchants, I can’t talk to some quest NPCs, for example Maven black heather, I can’t continue the quest. Initially, there was no such problem. Turned off all mods, same thing. Maybe it was broken by some mod, I don't know.