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You are not using a custom css in calibre viewer that has "!important" for fonts, are you?
Maybe the font is in a format calibre does not support. I think I tried it with TTF and it worked, but I've never tried OTF. Or maybe the font is not correctly embedded, and ADE and Explorer are using the version of the font installed in your system, not the embedded one, while calibre just doesn't use the embedded one and picks a default instead.
Why don't you post a sample epub, so we can test?
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