A family of Microsoft word processing software products for creating web, email, and print documents.
Posting screen shots using the Insert image tool may clarify what you are seeing:
Footnotes always have to appear on the same page as the text to which they refer, so Word may create text arrangements that are visually displeasing to do that. There are different circumstances that can cause this, but one hypothetical example is if the text following the gap has paragraph formatting marked as Keep with next.
Ajibola's suggestions look like the result of a hasty Google search, but you can view the Footnote Separator by choosing Draft view (View>Draft). Then, on the References tab, choose Show Notes. An extra pane opens at the bottom of the Word window with a Footnotes dropdown that allows you to select the Footnote Separator or the Footnote Continuation Separator.