H Priest bug in M Skitra?

My team noticed an issue during our last raid. During the mythic skitra fight if we wiped the holy priests had multiple stacks of Dark Ritual prior to starting again. Once we both had stacks of 16/19. We assume it was due to the angel form after we had died. We were able to remove it by hearthing out but that takes a lot of time. It happened 3 times. But not each wipe.

I had this issue on my priest in heroic.

still happens even to this day, sigh bfa

and still happening today…