Post a screenshot? Highlight the characters and check the Info panel for their unicode numbers.
Try disabling UTC?
What characters? Is it possible you are looking at ligatures in Bembo that don't exist in your Garamond. There are a lot of Garamonds out there, and I would suspect that many of the older, non-unicode, versions don't have ligatures. The same might apply to the Bembo, of course, but if you are going from an old Type 1 font to a new OpenType font, you might easily see ligatures suddenly appear.
Will post screen shot once I get to the computer having the issue, thanks...
The font is not older version, and these are not ligatures... they look diacritic.
Hi John, will post screen shot hopefully later tonight... thanks for the reply.