Footnote problems in Scriv for Mac OS

When I have made a footnote, sometimes this thing (as shown here: sprend.com/download.htm?C=7c3378 … aa91efa237) appears. I have marked only the text until the interpunction, but still he mark remains.
What’s the problem and the remedy?

I’m afraid the screen image you linked has expired, so I wasn’t able to view it.

Katherine