I've got a technically clean epub file that I made in Calibre. The table of contents is displaying well except for a sections labled (Untitled). I've looked for an html tag that might be causing this, but I'm stumped. This problem is also showing up elsewhere in my epub file in several places.
Below is my table of contents file where I'm getting one of those in the kindle viewer:
(note - linked because I didn't see how to paste the whole file here.)
Can anyone spot where things went wrong?