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I think it's an error in the book. To resolve it, use Calibre to remove the DRM and then reload. If it still persists, convert to Epub, delete the mobi or azw file, then convert back to mobi or azw and reinstall on your device. Should work fine then.
I have only run into this with self-published books, but even then, not often because most people seem to follow the rules. Calibre does a lot to fix errors by removing stuff it doesn't expect should be there, apparently.
Note: if you complain with an email message, very often there will be a fix for the book within a short time.
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