Throughout Shadowlands there has been a bug with mind controlling other players in PvP. When a priest mind controls an enemy player in PvP, after the mind control ends the player that was being mind controlled will, for the rest of the PvP instance, teleport around the map while moving. Their position doesn’t fluidly move around as they normally do instead they skip around, and their position is very unclear due to this.
Here are previous forum posts documenting the same issue:
https://us.forums.blizzard.com/en/wow/t/mind-control-teleport-bug/786534
https://us.forums.blizzard.com/en/wow/t/please-fix-mind-control-bug/789059
https://us.forums.blizzard.com/en/wow/t/mind-control-mc-bug-in-arena/795432