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If you have any styles with "Space before" greater than 0pt, they look wrong when they are the first item on a page, as the "Space before" setting pushes them downwards and you get a strange-looking gap above them. This is especially noticeable if you use a hard page break in order to move the next Heading 1 to the top of the next page.

I go into Advanced settings, and under Layout options check "Supress extra line spacing at top of page" and "Suppress Space Before after a hard page or column break".