I haven’t played with my pistols for a long, long time. So, the details are getting vague as to which 9mm ammo doesn’t work in which pistol. I have purchased from lots of manufacturers and some of the ammo is fractionally longer than the ammo from the other manufacturers. A few of my (cheaper) guns fire both lengths with ease. But I have one pistol which I finally stopped carrying because I kept hitting the magazine release by accident. But that gun would only chamber and fire the slightly shorter 9mm rounds. Have you ever come across this issue? If so, how do I avoid buying the wrong ammo?
The question is difficult to answer without examining the pistol and ammunition in question.
9mm is, precisely, a caliber, not a cartridge. There are many, many different 9mm cartridges.
Some 9mm cartridges are known by several names, even though they have the same dimensions.
Some pistols have reputations for being able to fire several types of 9mm ammunition, even though they were designed to fire just one type.
The .380 pistol cartridge is also known as the 9mm corto, 9mm kurtz, 9x17, 9mm Browning, 9mm short and 9mm Browning Court.
There is also the possibility your pistol has a chamber which was manufactured at the far end of the allowable tolerances.
The first, and most easy thing to check, is to determine what cartridge designation is stamped on your pistol (have someone else read it if you must), and make sure the cartridges used are the same designation as the cartridges indicated on the pistol itself.
Some older or foreign pistols may not have a cartridge designation stamped on them.