If it did that same malfunction with all mags, then I would consider the firearm.
Anytime you get (or have) multiple mags, number them. When a problem arises with the mag, it is easy to tell which for sure.
"A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed."
Life Member NRA
Life Member NAHC
Former President of the ECPT (Eifel Combat Pistol Team)