What you're describing sounds like primers that weren't seated correctly. If they were seated too shallow, the first strike of the firing pin will finish seating them at the bottom of the primer pocket and "arm" them by compressing the anvil against the priming pellet.
The second firing pin strike will then fire the cartridge.
Unfortunately, I've had more problems like this with Remington center fire ammo (rifle and handgun) than any other to the point where I simply don't use it if I can avoid doing so.
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