I recently purchased a UC 40 but have not had the opportunity to fire it. I have disassembled it to see how it functions and to clean it. In addition, I loaded the 10-round mags to see how they work (out of the gun). I noticed with each of the 4 mags, the last round nose dives and sticks as I manually unload each magazine. Is this a problem or will it work fine in the gun? Thanks for any tips.