Check your styles in your source document. Whether you use Word or Writer (or whatever), some heading styles might be numbered for outline or level. This can be invisible in the text, you can only see it in the Style edit box. If you don't turn this off in the source doc, you will get numbering in the epub - that is, numbered list styles. I have this problem periodically with Writer if I do a "save as" to a docx format before conversion. I have no idea what I do to sometimes turn this on.
Or as BetterRed said, maybe you have some conversion setting set to number. Try turning everything to default before converting.
You can also fix it in the epub editor, but probably easier in the source or conversion.
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