The problem is more likely to be your technique.
Small pistols are very difficult to shoot well.
You have to hold them in a death grip, with rigid arms, and not relax or flinch.
Your little gun needs every kinetic ounce of recoil force, in order to function properly.
If you flinch or relax your grip, the gun will malfunction because your hands and arms are absorbing some of that necessary force. Typically, it will fail to eject properly.
The P3AT we own is not ammunition sensitive, but it is technique sensitive.