Occasionally after doing pull ups or training in general, my hands feel weird (like they fall asleep, but just a tiny bit, a very mild tingling sensation).
Sometimes during the pullups, when I almost put my chin above the bar, I feel a weird sensation near my elbow, like some vain fell asleep for a second, then it's alright.

Three things to take in consideration: 1. I'm 18. 2. My elbows don't reach a full 180 degree when extended (my elbows are a bit to the side, I wouldn't say twisted, it's barely noticeable but still). 3. My pullup bar is located in the door frame. And it limits my grip width.

Any thoughts on why this may occur?

Thanks in advance.