This sort of problem is difficult to diagnose without access to the document and the student wouldn't thank you for that. Three issues spring to mind.


1. Are the sub headings terminated with paragraph breaks or line breaks. Click the ¶ button to check.
2. Has the TOC (a field) been properly updated or reinserted after making the changes?
3. Document corruption. Try copying all but the last paragraph break to a new blank document based on the same template.

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Graham Mayor - MS MVP (Word) (2002-2019)
Visit my web site for more programming tips and ready made processes www.gmayor.com