I've seen a case like this twice (a Glock 24 and my CZ75 compact) that was caused by the same problem. The round that didn't load hit the slide stop. It only happened with heavier bullets weights, but would happen with all of the mags and at any time during the shot string. A little careful reshaping of the slide stop ended the problem. Changing bullet weights and styles also worked, which is the easiest way to check for this problem. Compare the 147gr round on the left with the 115gr on the right and you can see how styles and weight can cause this problem.
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NRA RSO & Certified Instructor in rifle, pistol, shotgun.
An unloaded pistol is a paperweight.
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