Oh, it's so it's failing to extract.
Have you tried different ammo? Some of the cheaper ammo has a steel head, which is notorious for causing extraction issues.
Have you cleaned the shotgun yet? It's possible that preservative oil applied at the factory might have dried out a bit in the chamber over the years, and is causing the issue. Give the chamber a good cleaning and see if it helps.
As an above poster mentioned, it could be an extractor problem. Another possibility is a rough chamber.
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