Unexpected TOC entry
I have some books in epub format which I'm converting to .mobi to read on a Kindle.
Sigil shows the TOC entries as expected, but after conversion to .mobi, the first entry on Contents menu is bookcontent1_0. The text corresponds to item 3 on the TOC list in Sigil, and is line 1 of the section1.xhtml file, in a document with structure:
The normal first page entry for this book would point to section3.xhtml.
Since bookcontent1_0 seems superfluous, can someone help me suppress it, please? I'm converting via the GUI, not a command line, on a Windows 7 PC.