Automatic ejectors normally only eject a fired shell which of course is now a hull.

Have you checked to see if you have a broken firing pin.

You might also try switching ammo. Try modern Remington or Winchester ammo. Target ammo from Walmart or similar store might have different primers than the regular stock. I have had an occasional failure to fire with a modern Browning O/U with Federal ammo from Walmart.

So many guns, so little time!