I have a document that I need to put in 2 appendices. After my section break
(just before the first appendix), I've associated the style Header 7 to the
title of the Appendix, restarted page numbering, formated page numbering to
include the chapter number and then inserted the page number in my footer.

Unfortunately, the title for the first Appendix shows 'Appendix A', while
the page footer's page number is B-1.

Any ideas why?