The heading in the TOC isn't 'attached' to your previous Chapter. What you have is a TOC8 Style that's yet to be formatted the same as whatever Style (presumably Heading 1) you're using for the Chapter headings.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]

I'm still confused. In the "click level to modify" part of that dialog box is only numbers 1 - 9, (I think) corresponding to headings 1 - 9. In the "Link level to style" dropdown menu is no "TOC1" (or other TOC), so I am not sure how to modify that TOC style. The same applies for the Summary-style.