It is quite possible that it is a file (doc?...) that mislabeled as to being a HTM type
Select the book.
Tap "o"
(Do not delete, add or rename anything in this folder)
the Calibre folder containing the book
you should now be able to un-zip the contents to a Temporary Location, not inside the Library.
Now right click and Open With... Select Notepad (or your preferred TEXT ONLY) editor.
Is what you see normal looking HTML code ?
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