Starting over, since WordPerfect was not involved in the document. (By
the way, I have transferred docs with footnotes between Mac and PC many
times and this is not an inherent problem with MacWord)
Are you sure that the existing numbers are footnotes and not endnotes?
(or vice versa--are you sure you are inserting a footnote and not an
endnote?) Footnote and endnote sequences would be numbered differently,
and could explain this, and they look the same in Normal View.
Are you sure the existing numbers are real Word-created footnotes? Not
knowing how to use Word to create footnotes is more common than you
might think.
Document corruption could also explain this.
The first way to check for a corrupt document is to
copy the entire thing, *excluding* the last paragraph mark, into a new
document. That last paragraph mark holds a lot of information which can
get corrupted, and copying the text into a document with a fresh one
keeps your formatting, but can fix some glitches.
A paragraph mark is a ¶. Click on ¶ on the standard toolbar to show
nonprinting characters, including paragraph marks.
See this link for further info:
http://www.mvps.org/word/FAQs/AppErrors/CorruptDoc.htm