We just had a player bring Ultron down to 26% health and then quit the fight as they didn’t believe they could safely stun him prior to his regen going off. He had a ton of fury and pierce and it would have resulted in death. I then went to go in and attempt a fight and noticed that all of our charges were gone and he was back at 35% health. It’s like the prior fight didn’t happen and all of our charges disappeared. We both tried rebooting our games. We had a few other raid teammates jump in and everyone confirmed the same thing.