Totems Blocking Sanctum Mob Spawns

HI,
There is currently a bug I've encountered a decent amount in Sanctum Arena rooms where placed totems will stop the next set of sanctum mobs from spawning.
This can happen in "Battleground" arena rooms on Floor 2 and Infernum Rooms on Floor 4.


Clip:
https://youtu.be/sq812Fewiq4

See that as soon as my totems on the Northeastern side time out, the blue archer spawns immediately, and wasnt spawning before

Thanks :)