Hi! Can you give me some more specific information on which bosses or encounters you're having an issue with?
Oh dangit, I forget... I think one may have been... Ah, yes! The Jackalope ghost named Whisper! I was helping my sister, we all ran into battle and we defeated him but once we finished, he was still there. It was aggravating because it happened before.
See ya in the Skyways, and thank you! Sneaky Emma Everhart
This happened to me as well where I was fighting the boss in the last battle outside the jailhouse in the dungeon where you rescue Billy the Kid. The boss and a few minion were there, then a couple turns later 5 more minions spawned.