????
Seems like calibre tries to guess what the code page is, if it not stated. It may be the input files don't say what they are, so it might be worthwhile to set it in preferences each time before conversion. utf-8, cp-1252 and ISO 8859-1 are possibilities for English.
There is also more than one way to express these characters, one by number, such as #8212 and then in HTML, so this might be something to explore too.
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