The severed heads and corpses of demons in the Heart of the Protector tavern. (Pathfinder: Wrath of the Righteous)

I accidentally discovered a strange thing. When the main character decides to rest in a tavern, a bunch of demons' corpses appear next to him, and the severed heads of people are added to the inventory. If you try to ask NPCs, they are all silent. Who has already figured it out?
UPD: After a second rest, the corpses disappear, and the severed heads are added 1 piece for each rest