Hi. I was shooting my P3at with my buddy who bought my old 2nd gen P3AT of mine. I have 3 extra mags for easier practicing. I loaned him my mags and he was shooting them. After he fired the last round the slide locked open. I thought there was a jam or ftf. Nope just a consistent lock open after the last round. Slide closes when you pull out the magazine. Is this bad and does anyone else's do this. My current P3AT 2nd gen does not do this and that gun above never did this with tme or the extra mags.