Hallo guyz, first(sorry for my english,), i got a problem with my pull up when i'm pulling myself from the bottom position my right elbow seems to be more flare out than my left, it also happens when i'm doing close grip pull up, but when i do the pull ups, i have no idea it's uneven, i just feel their normal (even).maybe posture problem? Or muscle imbalance? May you give me solution or advice to fix this problem?

I have a problem with my pull up; When I'm pulling myself from the bottom position my right elbow seems to be more flared out than my left, it also happens when I'm doing close grip pull up. During the pull ups, I have no idea it's uneven, I just feel they are normal (even). Maybe posture problem? Or muscle imbalance? May you give me solution or advice to fix this problem?

Addition:

It also happen when I do close grip pull up.. My right elbows always seems to want to flare more than my left as you can see in the second picture.