Qarn (Hard) Hand enemy bug

I was in a group after the first drop down point and the Head / left&right hands just before the next area were severely bugged. The hands seemed to spawn really fast and they would grip the players. The grip would not be released on death. The first attempt we were all gripped and waited to die, the second attempt all but I were gripped and I killed the hands and the head and the grip still didn't disappear. We ended up abandoning as we were unable to remove the debuff on the players.