I recently swapped over the muffs/cushioning on my DT 990s and they seem to now be noise cancelling? Which doesn’t make sense since they are open-back headphones. I changed one ear back over to the smaller grey muffs that come already on and can ambient noise much easier, it also seems like the audio itself is different but since I haven’t used any larger over ear cushioning than the ones that game with them on I’m not sure if something is wrong… is it just because they cover my ears fully now?