Welcome to TFF Goose! Can you get a pic of the condition? take one of the position of the slide stop and mag follower orientation if possible. More than likely a some sort of issue with the slide stop. Take the slide off and insert a mag and see what it looks like. Clean everything really good while your there
I'm with Dan, I'm not sure just what position the slide is in once the last round is fired.
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What are you gonna do, talk the alien to death? -- (on Sigourney Weaver's worry about Guns in Aliens)
"Safety is something that happens between your ears, not something you hold in your hands."
"I carry a small gun to compensate for my huge Blue press." 
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