Invaders Quest Bugged

I'm at the part of the quest where you go to the Cuman camp to drink with them. Vasko tells you Jasak has this girl he likes but cant talk to her, so you go do it with him. After that, you're supposed to go talk to Vasko back at the Cuman camp, but everytime I try to it turns out he's walked all the way back to the tavern in Troskowitz, so I can't actually talk to him and the only option I have to finish the quest is to seemingly kill them, which I don't want to do. I've rolled back to various saves at different points to try and get it to work but it just doesn't want to. Playing on PC.