Tripled footnotes upon compilation of word-imported document

I have imported a lengthy word-document in .rtf-format to scrivener. I have consecutively transformed the in-line footnotes to inspector footnotes, and changed their font in Scrivener’s inspector. Upon compilation those “old” footnotes turn up with tripled numbers (only) in the footer of the word-document, but newly inserted ones come up as they should with just one number. This equally happens with compilation to .rtf as to word. I have attached (partially blackened) screen-shots for a better understanding (see newly inserted footnote 5 in comparison to the others).
Can someone tell me why this is happening and what I can do to prevent it from happening?
Scrivener Problem_1.pdf (199 KB)