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It's widows and orphans. They can be different from book to book; kepubs ignore the css rules for them, but epubs respect them. To get rid of them in epubs, you'll need to change them to 1 or just delete them in the book css if they're 2 or more, and add the following in the Kobo configuration file (eReader.conf in .kobo/kobo):
[Reading]
readingAdobeOrphans=1
readingAdobeWidows=1
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