With the release of this update I've seen heal act strange in brawl and raids. It seems when the heal actually heals the lowest hp teammate, it heals it, but the cleanse for it after goes to the next lowest creature. But the cleanse should've been on the creature that was getting healed.
Ex: There's 3 creatures, 2 are t.rexes the same amount of hp, and one is a healer that has the lowest hp, one of the rexes gets hit by a player / boss / minion this 1st turn. Next turn healer heals the rex that got hit and heals it but the bug cleanses the healer as it's now the lowest hp when the it's supposed to cleanse the rex. (Hope that clarifies it)
This is frustrating as I've made a strategy for a boss recently and it has an extra turn being added because of this side effect and this could ruin some brawl matches for some. Hopefully this is noted for the next "known issues".