It looks like a paragraph border. To get rid of it, select all (Ctrl+A) in the footer; then click the arrow on the border button (in the Paragraph group) and click No Border from the drop down menu.
For anyone to tell for certain that it is a paragraph border, you'd have to attach a file in Word format, though.
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Stefan Blom
Microsoft Word MVP
Microsoft 365 apps for business
Windows 11 Professional
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