I've been through hundreds of rounds with different mags in my BG380 and never had an issue. The followers are anti-tilt so probably not that. Get a pencil or something and run the follower down and see if there's any binding and check the spring orientation as mentioned above.
I might measure the followers on the magazines and see if the one is slightly oversize or has a burr on it. I might use a sheet of fine sand paper to reduce the size .001-.004. It might make a difference. The other thing that you could do is return the mag to S & W and see if they will swap you one.