Can't select using Reading Order Tool after clearing page

[davidm74795833]

A header was showing in the reading order but was not showing in the Accessibility Tags panel. To try and fix this, I went back to the page, cleared the page structure, and tried to manually tag each item. But once I hit the tag that I wanted, I could not see the dark box with the number that usually appears when I make a selection. The whole page is like this. How do I fix this so that I can re-establish the reading order on this page AND have all the contents in the Accessibility Tags panel?