A family of Microsoft word processing software products for creating web, email, and print documents.
If you switch to Draft view and then click on Show Footnotes from the Footnotes header bar, you can select the Footnote Separator and modify its paragraph format to remove the extra space after it that it appears to have acquired. Clicking on Reset may do the same thing.
However perhaps the issue is with the formatting of the paragraph containing the footnote, which will be in the Footnote Text style, which may have acquired some space before it.
Another thing to check is to click on the Show\Hide (¶) button and look for empty paragraph marks (¶) between the footnote separator and the footnotes