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I think Darryl may be onto something. Take the barrels off the shotgun and see if you can load 2 live shells into the chambers. It may be pressure from one of the loaded barrels is pushing the "extractor" down, preventing a second round to fit. If so, the extractor wasn't cut properly.
That doesn't happen... it's here forever... did you get it fixed? I believe an inspection by a gunsmith would do far more than posting questions on a forum.