i could extract & post a single xhtml file, if that is allowed. but if something works in sigil yet not in his editor, that seems strange.
if i open in notepad++ & select encode with ansi I see this- so it seems there is a non-displayable character - which sigil can handle but calibre editor cannot:
<p class="body">Â*</p>
I will risk attaching a zipped single chapter extract, purely for testing /debugging but will remove it if told to