My Dad has a Taurus PT1911 and it did the same thing. It is indeed the gun, not the mags. I tried every 45 mag I own (about 50 of them) from all manor of makers and only the mags that came with it did so without issue. By comparison the Colt, Ruger, Springfield and SIG 1911's I owned at the time would drop all those mags freely. Also at work we have two PT1911's and one of those drops any mag, the other hangs up like Dads gun. It is an easy fix as described. Its a shame a new gun needs "Fixing".....but many do.
Miraculously Dads PT1911 is one of the most accurate 1911's I have ever had the pleasure to shoot. It at least has that going for it.