It sounds like the gun is picking up the next round to load but not injecting the empty case. So two possibilities are that your injector has broken and is not tipping the case out of the gun or the toggle is not going back quite far enough for the empty to hit the injector hard enough to be thrown clear. If This is something that just began happening and happens consistently then I suspect that your ejector has broken and is not tipping the empty case clear.
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