Never had the problem with any of my CZ factory mags.
CZ 40B, 75 BD Police and Kadet Conversion Kit. All continue to work as they should.
I'm sorry you seem to get the bad ones.
NRA Chief Range Safety Officer, Home Firearm Safety and Pistol Instructor
"There are three classes of people: those who see, those who see when they are shown, those who do not see."
Leonardo da Vinci