It appears more randoms have their creatures set to different factions. One of the Ogre Lairs in the Spire had Ogre Berserkers & co fighting the Ogre Bandits. In combination with Granny's earlier post about the Ice Trolls, I think problem/bug is present in more than one random.
Also present between various goblins (Goblins Assassins v Goblin Rogues/Enchanter/Troopers)
I noticed the bone dancers and skeletons in the quest in the in-between also were battling each other. Which may or may not be intentional.
Please provide the area names as shown on the loading screen. The fact that they're random areas makes it hard for me to figure out what area you're talking about.