Are you sure you didn't do something to change it.
Whilst the Date column is set to current date & time when a Book record is added (imported), it's not immutable, i.e it can be changed by the user. FX: I clear it when I add a book, and set it to current date & time when I finish reading the book.
I doubt having your library on a NAS for a while would have caused this anomaly.
BR
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