2.1.561 Part 1 Section 17.18.101, ST_VerticalJc (Vertical Alignment Type)

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a.   The standard says that both justification is not used if multiple sections are on a page, and does not specify behavior for other alignment values if multiple sections are on a page.

If there are multiple sections on one page and they have different vertical alignment, then Word will ignore the vertical alignment specified and will use the default value of top.