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I had a similar problem where the books I was reading were gone from the home page. I have tracked the problem to the date.
After doing a factory reset I loaded back my books. Then after it processed the books, I changed the date, because it had changed the Time Zone. After that every book I was reading was disappearing from the home screen, Because the books I had added previously had a newer date/time than the current one.
My guess is wait until you reach the previous date and they will stay there.
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