u/Turbulent-Tough-5801

So recently I got my first m50x pair (used) and I LOVE them amazing sound and design too imo. Got for em a nice Wicked headband cover and the earpads are new (not wicked some random brand) but what I noticed at first is that the clamp force is not that strong as people say. I mean they stay on head okay but when I tilt my head down a little when I play guitar for example they start to slide off.
Is that normal? Are my headphones broken?

Got those brand new audio technica m50x for like 97$$
From what I see they kinda look fake? If someone knows exactly please let me know so I could get a return asap

As you can see I have a small gap because I drilled straight. The pin stays in place and holds it tightly but I have a small gap, do you think this gap will be a problem in future? Should i fill it and do a new hole? I moved the pin from the back because i had terrible neck dive
Guitar : Harley Benton Amarok 6