If I'm reading you correctly the gun fires OK and ejects every time but if a round is chambered and not fired it can not be ejected manually? If that is the situation I would look to see if the "factory" bullets have been seated deep enough into the case. There might be inconsistency too or they may not be crimped hard enough and are backing out during recoil.
Overall, your barrel may be not have enough "lead" between the chamber and where the rifling begins. In other words the bullet may be touching/sticking/jammed against the rifling. Once fired it doesn't matter--the bullet is gone and then the case ejects normally.
At this point I would guess the chamber is OK since it loads but polishing wouldn't hurt. A good check would be inserting an empty case (preferably sized) to see if the same problem occurred.
It will be interesting to see how the reloads and rounds from other manf function.
My 2 cents
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