So you're both sticking to your bows? And might be release type. My shot is different when switching back and forth.
Hahaha! In all seriousness, it's pretty common for 2 different shooters to shoot the same bow/gun in 2 different spots. My uncle and his friend used to share a crossbow. My uncle sighted it in for himself and hunted with it. The next day his friend came and got it, shot it at the target. It was way off he said so he figured the sight got bumped. So he sights it in. Next day my uncle gets it to hunt with it.... You see where I'm going with this... After a few times of this, they realized what was going on and bought another crossbow haha Sent from my iPhone using Tapatalk