Hello friends,

I am helping a colleague to complete her thesis for a bachelors degree.

I am correcting the final document (it is around 70 pages) for grammatical and format mistakes.

I have almost done the work, except a format mysterious issue.

There are black, horizontal lines, at the top of the pages of the whole document. I cannot remove these lines, and also they appear after printing.

I tried solutions like "Page Borders" and "Borders and Shading" functions but I failed to remove those lines.

Could you think how these mysterious lines could be removed from the document pages?

Thank you in advance.