A family of Microsoft word processing software products for creating web, email, and print documents.
In Word 2013, the first footnote (on a page) in a multi-column document will always be below the left-most column, even if the footnote reference in the text is in another column. Also, footnotes will always be "balanced," that is, distributed between columns. See http://support.microsoft.com/kb/2740483/en-us/ (Changes in content layout between Word 2013 and earlier versions of Word).
To get the older behavior, you can save in *.doc (Word 97-2003) format.