Map modifier "Area contains many Totems" preventing mob spawn in hive fortress

Map modifier "Area contains many Totems" preventing mob spawn in hive fortress.

Initial waves few mobs were spawning.
After some time no more mobs where spawning until I went away from middle towards spawn points and cleared totems.

Same just happened to me.
I had no mobs spawning at all because it was all totems in first wave i guess, killing totems fixed it for me too.