Heydrich:
Sounds as though the slot cut in the mag body was not made large enough to fully accept the mag catch. Usually, the top edge of the cut is a RCH to low when the mag is inserted and a positice lock is not achieved. Take the left grip off, with great care not to chip the upper rear corner, an insert the mag as RK suggested. compare the manner in which both mags seat. You should be able to tell why the aftermarket mag is not seating, if that is, indeed, the problem. With a 3 cornered Swiss jewelers file you should be able to remedy the problem by filing the top edge of the magazine, thereby allowing the mag catch to fully seat. Don't get carried away. Just take enough off to allow the catch to lock.
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