I was doing the daily quest, the one you get to through swill pitz, where you kill the goblin shamans to disrupt the rituals and release the bones. We started by turning right and killing the first shaman, but after he was dead we hit the bones and nothing happened. All the bones after that worked, but this first one was bugged and never released.

On the very last one, the bones released the spirit before we killed the shaman. Then when everything was clear, we tried hitting the first bugged bones again, and they still wouldn't release.