In the brief time that I looked at that file, it is apparent the file was not constructed with STYLES. I applied styles to the first two pages and the issue in question disappeared. (I could not find what was causing it..so, I applied styles). You may want to visit:
Understanding styles | ShaunaKelly.com or
Understanding Styles in Microsoft Word
and review...it can only help you. In the interim, I am attaching your file with the styles applied for the first 2 pages. (I just applied any styles without thinking...you may want to apply what is handy for your work).