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Ratings are stored as a number from 1 to 10, but represented as 1 to 5. I don't know why this is, but my guess is something changed a while ago.
What I think has happened to you is that you have some ratings that aren't 0,2,4,6,8,10.
I am reasonably sure you can fix it by searching on a rating, selecting all the books, then using the bulk metadata editor to set the rating to what it should be.
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