For reference, I took a 9mm mag, loaded a cartridge, locked the slide back, and slammed her home much more vigorously than I actually do, and removed it. Then repeated the process with a 9mm cartridge in a 38 Super mag, and placed them on the table for a photoshoot next to identical mags without rounds.
Note how all the feedlips are nice and parallel, with the cartridge retained inside the mag body, even after an overly violent slide back insertion, while your mag is so bent out of shape that the rear of the mag lips (the actual width they should be), quickly spreads out several 100ths of an inch only about an eighth the way up the cartridge.
You need a new mag.