It's fairly normal.
I have semi-autos that will do it.
It's just how the rounds sit when they're loaded into the magazine. Some of them are firmly held by others and the spring pressure, while others, for whatever reason, become free to pivot back and forth.
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"The gift which I am sending you is called a dog, and is in fact the most precious and valuable possession of mankind" -Theodorus Gaza
Baby Jesus cries when the fat redneck doesn't have military-grade firepower.
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