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This is the widow and orphan mechanism. The default is to have both at 2, meaning that the renderer will adjust text on the page so that at least 2 lines of a paragraph are present at the top (widows) or bottom (orphans). If your paragraphs are appreciably longer than the amount of text that can fit on a page then it will cause exactly this problem. Since this is very rare in current fiction it's uncommon to see it.
To fix it, add
widows: 1;
orphans: 1;
to the body section of your css.
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