RH11: Index Page Not Displaying TOC

I've searched and not found any other results with this particular issue.

When I publish my files in a Responsive Layout I have the following set:

Output Folder and Start Page (went back to using Index but generally have a unique name for the start page)

Default topic was selected using the SELECT button

Table of Contents is identified

When I Publish, that start page does not display the TOC. I have to select CONTENTS button/link to display the TOC. Previously, my files would display the TOC with the Start Page.

Additional Note: When I select another page, the content moves to that new page, but the TOC disappears again and I have to select the CONTENTS button again to view the TOC.

What setting am I missing? I've searched Help, I've searched the community as I am sure there is a simple setting for this that I am missing and found nothing that addresses this. I do see the TOC once I select the Contents link/button on the page and can navigate, so it's working, just not displaying by default with the start page.

Thank you,

Susan

UPDATE. I started resolving broken links and when I recently generated and viewed, the TOC shows up. However, not all of my broken links are resolved yet. I am not sure what the relationship was, but I"m happy it is resolved.