As long as we're talking about calibre conversion anomalies, One thing I see from time to time is that some of the letters that end up in the converted Word document are not recognized by spell check as being those letters.
They look perfectly fine, but just about very word in the document has the dotted red line under them, indicating there is a spelling error. It's not a country selection in the Word document, it's just that the letters don't show up in the spell check tool as their actual value.
Typically, it's the vowels that are problematic, along with t, l, m, p.
I simply copy one of those letters and past it in the search slot and then type the same letter in the replace and do a global search and replace. Annoying, but typically not a long process to fix.
If I see it in one book by an author, I will likely see it in most or all of their works. Which makes me think it might have to do with how they generated the original source document (what software they used) and if they used any typesetting software to prep it for publication.
It's not R
eedsy, which is a company I've seen mentioned by various authors, since their books don't have this issue.
If I can recall a book that had this problem, I'll let you know.
