80% of the books on both of my Kindles have been loaded via Calibre, and none have ever disappeared. You have a filter set that is hiding them. It would be front page news if Amazon did that, after the debacle years ago concerning one book that was sold on Amazon by someone who did not have the rights to do so.
Amazon removed that one book, and gave all customers it affected $35 for their inconvenience. They also publicly stated that they would never do so again.
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