Encountering Unkillable Mobs

It seems that 2 mobs from the new ancient shard thing bugged out on me. One I can't hit at all and my minions won't even try. The other I can hit and my minions light it up but he's stuck at 30% health and won't go any lower. Both will attack me. So I cannot complete it to get the rewards and it was the largest reward I've had so far. Awesome.

Also what is up with temple??? It took me 10 minutes to kill a commander. He didn't have any strange debuffs or anything but he would only take a sliver of damage every once in a while. A lot of the mobs in there are taking incredibly long to kill. Longer than any previous pinnacle boss even.

Game feels broken.