Sounds like both magazines need the feed lips tweaked a little. On the original you might need to bend them out just a little to ensure the next round he being held high enough for the bolt to catch. On the replacement, you'll need to bend them in just a little to keep the rounds from springing out all at once.
The original mag that came with the rifle should have been tuned at the factory, but sometimes one sneaks through that isn't spot on. The replacement ones you purchase will all likely need tuned a little as they've never been mated to a gun before and are as-delivered off the production line.
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