So as I understand this, you fire a round and then the gun cycles, putting a fresh round in the chamber and also stripping another round out of the mag at the same time? That's hard to picture happening since the way the mag is built only one round is on top.
This about as far out in left field as you can get, but is there some way you might have gotten magazines for a different caliber? Could someone in the gun store have been looking at a couple of guns at the same time and mixed the mags so your slide is contacting two 9mm rounds at once? I have no idea what other mag might fit in the P95, but suppose the mags are from a .40 or .45? That might allow two 9mm rounds to be riding almost next to each other instead of one above the other at the top of the magazine.
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