The first thing to check when we see an incorrect hyphenation is to check if the language in the ebook is set correctly. Calibre tells you what the language of the file is. Sometimes I have found books written in Italian with English set as the language. I'll let you imagine how they were hyphenated.
You can also find the language by opening the file in the calibre editor or with Sigil and in the content.opf file you can find <dc:language>it</dc:language> or <dc:language>it-IT</dc:language>.
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