We've figured out that there is an issue with Тотем каменной кожи
. Basically, it isn't correctly removing its melee damage reduction when it expires. We've seen in examples given where the player had previously grouped with a Shaman, and carried forward the effects of the totem.
We're fixing this, and the fix will be in the next build of WoW Classic. We'll put it into our Known Issues list until then.