If these lines start showing some strange formatting characteristics, it is more than likely because you've made some changes in how the Normal style is defined.

By default, the Footnote Separator and the other separator lines used by footnotes and endnotes all use the Normal style. While the above works just fine, there is one other thing you might want to keep in mind. Use Word's regular formatting tools to change the paragraph indentation on the separator.The current separator appears in the window, and the insertion point should be within the separator. Using the Footnotes drop-down list at the top of the Footnotes window, choose Footnote Separator.Click on the View Footnote Area radio button.If you have both footnotes and endnotes defined in your document, Word displays the View Footnotes dialog box.Display the References tab of the ribbon.(Click on the Draft View icon on the status bar of the document.) Make sure you are viewing your document in Draft view.As a paragraph, you can easily format it just as you would any other paragraph.

The footnote separator is inserted, automatically, by Word in its own paragraph. Jim would rather have the footnote separator align to the left column, rather than being indented. It lines up with the indented first line of a normal paragraph. Just above the footnotes and below the page's text is the footnote separator. When Jim prints his document, the footnotes appear as they should at the bottom of each page.

How to add footnote to right margin