All too often, what looks like sufficient space to my eyeballs is not seen as sufficient space by the renderer. I've noticed that on my computer with multiple ebook softwares (Adobe ADE, Thorium, Kindle 4 PC, etc.) and on Kobo, Kindle, Tolino, Sony, etc. ereaders.
Reducing the builtin padding at the bottom of the page, changing line height, etc. can help. On occasion, I've also removed the blank lines at the end of a chapter that some authoring software and/or authors seem to have an unnatural love for.
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