If it happens with every book, it's the Kindle. Restart it, but one particular book may be causing it.
If it's only one book, or one book triggers it for all books, then download a fresh copy (to PC, not Kindle), remove DRM if present, convert to epub2 in Calibre and use epub check and fix it. Then convert it to azw3 and copy to Kindle via USB (Not Sent to Kindle via web or email).
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