This has happened a couple of times so far. I will go back to my camp for a long rest. Upon arrival my party and I will be thrown into combat with either one of the characters I didn't have in my party at the time, or a random NPC staying in my camp. The first time I was forced to fight and kill Scatch the dog. This latest time Gale wanted to fight the party and we were forced to kill him. I am not sure if these events were supposed to happen or they are bugs.
*SPOILERS*
On Gales death it prompted a quest line to resurrect him. I figure this is supposed to happen, however I didn't believe I would have to kill him in camp for this to happen.