Queued up for Vet Fang Lair, cleared trash no problem, but the very first boss was bugged. Every time we killed the first Bone Colossus, she immediately teleported back down to the center, began the beginning fight animation and speech again, and instantly reset health to 100%. We cannot get the second wave of enemies to spawn, she immediately resets upon 75% health. We exited the instance, ported in regularly without activity finder, and are still experiencing the issue.