Having looked at your document, I see that you have two continuous section breaks, so you can have a single-column section between a pair of two-column sections. Naturally, the SECTIONPAGES field can only report what its own range spans and, as soon as that extends over a page boundary, the number increments.

With your single-column section, you might do better to not have that and, instead, put whatever is there into a textbox attached to the second two-column section.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]