It looks like enough wear has occured to allow one rounded off surface to slide over another rounded off surface. If you have already determined that this is not a slide stop spring or magazine interface issue, you can perhaps improve the purcase between both parts by squaring off the surfaces, starting by the one in the slide. The front wall of the slide cut-out seems more rounded off than it should be. A micro dremel head could bring this back to a more square off profile and solve the issue. If there is no improvement, a bit of squaring off of the front surface of the slide stop wing would be my next suggestion.
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