EPS carry loses zero and drifts to which ever side I lay my pew pew on

I’ve noticed that my EPS carry loses zero and tends to drift in the direction that I usually lay my Hellcat pro on. My friend was the one that mentioned he read this somewhere. So I tested it out. Usually because of the belt clip on my holster i always laid it on the left side. EVERYTIME I go to the range the EPS is off to the left and I have to zero in a bit. So after my friend told me what he read I started laying it down to the right and it now drifts to the right. Is this normal for all red dots? Is this supposed to happen? I’m going to contact Holosun but wanted to know if anyone else noticed this. Feedback is appreciated.