Ok I figured it out, I used the annotations plugin in the past to extract annotations and it was set to put them in the comments field, where the book blurb goes.
I guess all I need to do at this point is find which comments have annotations in them and move them over to a different field. They're appended below the blurb, and I'm not sure yet which books have annotations, bookmarks, or notes in the comments field and which don't.
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