I had earlier went to Erorag to just do some bashing and whatnot, and I've noticed this before in another area awhile back--actually Bloodstone Quarry now that it jogged my memory, that there are ungodly stacked amounts of mobs in one room or several that is not normally the case. I figure its a bug within the prized spawnwave code or something, but I will bug it in case, however-here's a screenshot when zipped past the stack and glanced into the room, just to make sure I'm not going crazy..
https://gyazo.com/be02a8b4bf7b79205c9da8fa063aab75
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Edit: I admit it doesn't quite fit cause it's -just- the two-headed ogres from your screenshot, but in Macabre it's all the beasts. I can't even engage cheese mode and duck in and out of the room to hit mobs when they're stacked like that since you hit one, they all aggro and hit you.
In any case it's super annoying cause clots like those are deadly to unarti'd/non-speedyquick-bash classes. As if Erorag wasn't a death trap to begin with...