This may be rare with chrischance, but is certainly not rare in general, as many people use the insert page break before with the chapter heading style, and the best way to get rid of it is to edit the style, not to manually change the formatting on the page.
Indeed it is, but it does not sound like that would have been appropriate advice in these circumstances, as the OP does not appear to use Word at that level. And, particularly in relation to formatting a document for publication as an ebook, at times it can be better not to use a style (particularly if the style is "Heading 1" which is a universal style and can be defined differently from machine to machine).
Ebook formatting appears to involve a lot of "get rid of all but the most basic formatting".
This is also a fairly rarely used setting. Many skilled Word users, particularly novelists, may perhaps use it - but I would actually be very surprised if the majority of Word users knew that it was possible to set a style to automatically include a page break before.
[Oh, forgot to mention another "page break" possibility - sometimes very new users of Word make "page breaks" by hitting Enter until they're on the next page. You might want to do a search for multiple returns, as I gather that is another thing that ebooks don't like (blank areas).]