A family of Microsoft word processing software products for creating web, email, and print documents.
In my experience, such elusive text is often saved in a header that is not currently in use. Enable both "Different First Page" and "Different Odd and Even." You may need to add pages to a given section in order to see all three headers. You'll likely find the text in either the First Page Header or the Even Page Header.
I looked at your document, and there is text in the First Page Header. The primary Header (which becomes the Odd Page Header) has an empty table; the Even Page Header is empty.