YES!! You do have a problem. Perhaps several. First a CAVEAT: I can't see nor fondle your rifle so some of this will be a WAG (Military acronym for a Wild Ass Guess). You have a very severe (bad) Head Space problem. Optimum head space for your rifle is .004 and the head space you describe is way way beyond that. If everything worked as it should before you sent it in and you just wanted a stuck case removed, I would have to question if "your" parts were used to reassemble it. Notwithstanding ......
It this point you have an unusable rifle. It WILL continue to separate case heads. I personally (were I your Gunsmith) wouldn't suggest it even be shot until it's ills were fix'd. It also sounds to me like your lever is bent. I don't portend to know all. It also sounds like you have out of spec links, perhaps an out of spec Bolt, or the barrel was incorrectly head spaced (common Uberti) when the rifle was built.
Now. This is not a WAG. If your Gunsmith/Store let you walk out with the rifle in the condition it's in, your Gunsmith is incompetent. Whom ever worked on the Rifle for warranty is incompetent. FIND A NEW GUNSMITH!! And, your rifle Needs to go back to the manufacturer under warranty with a letter outlining the problems you have had with it.