I dunno if it's a bug per se, but it sure feels like it. In the 32 PoE, with the Cabal, the add mobs respawn waaaay to fast. Normally it would be "Break boss man's shield, hurt him, add wave" but the add's pour in like ants on an apple pie. There's so much of them in wave five that it borders on absolutely unplayable. Even worse, it's pretty much all Centurions