There are at least 2 CSS errors in the post #16 epub which may be causing the Kobo problems. The Calibre editor flags them.
UniversalPagesStyles.css has an incorrect comment - line 6 should be /* not */
UniversalTemplate.css has an invalid font-family - line 15 should be font-family: "VeraMono"; not font-family: "VeraMono;
Correct those 2 lines and try again. Don't forget to pick 'Document Default' from the Kobo font menu if you're trying to use embedded fonts.
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