Unkillable mobs in T17 map

So, this has happened to me twice now, started a T17 map and once inside, all mobs are immortal. My build is a Chieftain Fulcrum, DD, usually melting the entire map when things start exploding. But in this case, nobody dies at all. I even tried bringing in a friend who runs Original Sin, a pure chaos build, but nothing dies. Brought in other players too, but nothing can be killed...

The image shows the mods on the map, I don't see anything special about it. What I'm thinking myself is if "Players have 137% less area of effect" has anything to do with it? Spell suppression shouldn't do more than guarantee they have 50% spell reduction, but apart from that, I don't see anything special about this map.

It was the "lesser aoe" entered with my Boneshatter Jugg and could kill mobs.