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The book, probably.
Open it in the calibre editor and check for errors, then have the editor auto-fix them. Often this helps. If not, check the file structure in the book - if there is one huge html file instead of each chapter having its own file, splitting that file into multiple parts would help too.
Alternately, you could try to convert the book to kepub - the kepub reader on a Kobo is less sensitive to various structural and formatting issues than the epub reader.
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