Almost definitely an overly worn lug on the internal end of the mag-release lever, or a badly worn mag (obviously you can rule out the mag if you had the same problems over multiple mags).
I'm glad to hear that the SigPro did well in shooting. I really think I didn't give it a fair shake in comparing it to my 229. I am also glad to hear that you took the time to shoot both. If you happen to buy either one, you will be well served by it.
You mentioned the Sigma, never have liked that piece. Then again, it probably goes back to the first time I handled one. Whomever had field-stripped it previously had reassembled it somehow incorrectly. I had no idea and slowly squeezed the trigger on the (verified empty) gun, only to have the whole slide eject itself off of the pistol with some force. The gunseller and I looked at each other for a second, and he took the gun back without a word. I think it coloured my opinion of the gun from then on.
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