Magazine ejecting when slide closes on Buckmark

[melliw]

Hello brain trust. I bought a buckmark and took it to the range. After about 20 rounds, each time I fired the gun the magazine would eject. I switched it out using 5 other mags and the problem continued with each magazine. Took it home and locked the slide back. When I released the slide and allowed it to close on its own, same problem existed. Magazine would drop out.

Forgive me if this issue has been discussed. Any ideas