Sections may have more than one footer (and similarly for headers of course). Each type of footer (header) must be separately linked, or unlinked, to its "neighbor" in the preceding section.
For more on sections, headers, and footers, take a look at
http://wordfaqs.mvps.org/HeaderFooter.htm.
You may also find
http://word.mvps.org/faqs/formatting...apesection.htm helpful.