So for some time I sometimes had a wierd issue on Garrosh 25man HC. My vengance did not stack at all, or was scaled wrong os something. Seems like it capped at 30% of my cap and could not move or do anything.
Anyone had the same issue and know how to fix it. After I reloged after 3 wipes it was fixed again.
Here is the log not sure you can get anything out of it.