I was in a shop, and i wanted something so i killed the shopkeeper but when i want to pick somthing it open a trading window. And there is "Vins talking with".
And even if i cut the carcass of the shopkeeper it's the same.

EDIT:
And after i droped my knife and when i wanted to pick up my knife it open a tranding window

Are there other shopkeepers in town? From the limited testing I did, you have to kill all shopkeepers in town to loot the shops. Or it could be related to nearby villagers too, since in the process of killing the shopkeepers I ran off the villagers too.

Fixed.