G23 Slide stop problem.

I just got back from the range and I noticed when I was seating my mag hard into the well g23 gen4 it was releasing the slide by itself. My first guess was that I had a bad extended slide release lever and I switched back to my factory one but that didn't solve the problem. I also thought maybe I had a bad magazine and that wasnt the problem. It happens with all three mags.

The weird thing is it doesnt happen when the magazines are unloaded. I have tried my hardest to make it happen with a unloaded mag and the slide will stay locked back no matter what. Im confused and Im looking for some help. Thanks.