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I haven't seen this on an Android device before, but on e-ink Kindles a book constantly returning after being deleted is a sign of failure of the flash storage of the device.
The file appears to be deleted, but only the copy cached in RAM is actually gone. It stays behind on the flash storage chip due to a failure to write changes. Eventually the device re-reads the flash storage and the book files re-appear.
If you are using a removable SD-card, you may want to try replacing it.
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