Nothing sticks out in the CSS
Quote:
WARNING: The file images/00004.jpeg is not referenced****[images/00004.jpeg]
WARNING: The linked resource 'XXXXXXXXXXXXXXXX' does not exist****[styles/0001.css]
WARNING: The CSS font-family name LiberationSerif does not match the actual font name Liberation Serif****[styles/0001.css]
WARNING: The CSS font-family name LiberationSerif does not match the actual font name Liberation Serif****[styles/0001.css]
WARNING: The CSS font-family name LiberationSerif does not match the actual font name Liberation Serif****[styles/0001.css]
WARNING: Invalid id: 0-d271ffb4ca564f238f9110f897b05457****[text/part0000.html]
Big list of invalid ID, won't stop it converting or working
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TOC seems OK
Converts fine for me (quickly) to epub2 even with those faults in the CSS
Calibre 6.10, Linux Mint 20.1, Mate Desktop, custom theme.
So I tested epub3, which took a little longer and also OK.
Unless your original images has a broken one?
Can you view the azw3?
My default settings include
Use Tablet for Images
remove the CSS with line-height or white-space
I'd fix those "errors" anyway. The font ones are silly and while the ID thing doesn't seem to matter it can be fixed with one click.