Noise cancelling more pressure in one ear

Has anyone ever experienced an imbalance with the noise cancelling function?

My headset otherwise works perfectly fine for audio, but when I turn on the noise cancelling function, recently it feels like there's more pressure in one ear than the other. I know this is the headset too because it works when I switch ears with it.

From what I can tell too, the issue is made worse in a place with a lot of loud deep noise like a bus.

Edit: This unit is almost 6-7 years old now since I bought it around 2017-2018. So no warranty is likely available.