It's been that way a couple weeks now. Since the June 28 update I believe, the one that nerfed veteran steadfast servants and they updated pre-planes of power mobs.
Be careful going down there. Most of them are easy but one of the side rooms has some grimling manawielders. When they spam that they are casting it is big spam. There are at least 80 mobs standing in the same spot. A picture of them attacking was the shot
July 19. There are all new...different grimlings. They are still not listed here or every appear in the mob graveyard. I have not had time lately to list all the new ones but yes, the mobs are different, more scarce, lower levels, faster re-spawns and overall bad placement. Oh, and no windstones. Used to be one of my favorite hunting spots, now just a zone in the way to go somewhere else.