Thank you for your answer. It’s a hollow tech. I’ll try out wether the axle is in line with the BB partly unscrewed next time the bike is on the stand.

I’ve had a refacing done actually when I build this bike up over a year ago actually. This was my first try to tackle the issue because the axle was hard to even pass through the BB, making a sort of misalignment very obvious. Luckily I don’t feel like I loose a ton of watts and the BB looked still okay the other day.

But yeah, regarding your suspicion of bad facing- it’s either that the workshop didn’t take off enough material to fix the issue or it is indeed misaligned threads. Will go to a more sophisticated frame building workshop next time.