The follower spring is weak on the front side of the magazine. Take the magazine apart, then stretch the spring and reassemble.

To test your/any magazine follower, place 2 cartridges in the magazine. Then lightly press down on the top cartridge and let go. Watch if it snaps back smartly. If it's slow or sticking you found your problem.
There is always more spring pressure at the front of the magazine. This will prevent the round plowing into the feed ramps.

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