Duplicate numbers in Footnotes

I am experiencing duplicate digits when I compile my book into PDF form. For example, The marker for a footnote in the text, footnote 1 appears as 11 , footnote 2 appears as 22, etc etc. Any ideas of how to deal with this? I imported my book from rtf into scrivener, originally written in MS Word

Something I would try is copying the text of the footnote, deleting it, and then adding a new footnote and using the Edit/Paste and Match Style command to strip out all formatting from Word. That may not be an ideal solution if there are hundreds of these acting this way, but it might at least give a clue into what the source of the problem is.