If possible, borrow another 1911 magazine and see if it has the same problem. If it does, the problem is the shape of the mag release (the bevel on the underside isn't deep enough) if not...
Some aftermarket magazines have the mag catch notch placed a bit higher than normal, "to improve reliability". A decent idea, except some 1911 makers and/or sellers of 1911 parts, offer magazine releases that also place the mag a bit higher, "to improve reliability"... and if you have a gun with both, you could run into some problems, especially with sub-caliber pistols, that have uber-extended ejectors.
But I digress. This sounds like a mag catch problem. If you take a file to it, be sure not to make the catch narrower, you just want to make the underside bevel start from a bit further out — to the right, as the part is placed in the pistol.
Too many people miss the silver lining because they're expecting gold.
M. Setter
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