Update:
This is an HTML error somewhere in the file. I sent the OP his ePUB, pared down, that built at KDP with fonts; I suspect an open tag somewhere in one of the XHTML files I'd pulled out. He should be able to find the error in pretty quick order now that he knows it's not his CSS, etc. File was clean otherwise and it's not the font-names, spaces, lack of spaces, etc.
Hitch
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