Thank you both for your replies.
Better Red:
I don't think that's the problem. All my existing books are fine. It's only books that I'm only now converting.
theducks:
My setting is exactly the one that you offered, it is also the default automatic one when installing calibre.
I really don't understand what is happening. I can right now the way things are convert from: txt, epub, mobi, docx, odt to epub or azw3 with no problems.
But from any format: mobi, epub, txt, docx, odt, if I convert to mobi, I get the leading number before the chapter. It is ONLY when I convert to mobi and it is always when I convert to mobi.
This suggests to me that there is a mobi output setting someplace that controls the bulleted numbering before the chapter. But I can't find any such setting.
I'll keep trying things. If I find a solution I'll post it here. I just figured someone else must have had this happen before. Thank you all for your help.
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