I fix everything: metadata, validation errors, and obvious formatting problems. I prefer books in a series to have consistent covers and formatting, but if the publisher decides to do something radically different, I'll leave it. I've gotten better at fixing as the years go by, so the early books aren't done as well as the later books. I was driving myself crazy by trying to go back and refix everything, so I decided to fix only the books by the author I am currently reading or about to read. It's a pain for authors with 50+ books, but it's better than trying to refix the entire library all at once.
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