Ok, I have searched but have not found anyone else who has discovered this.
I have speed dials set for several contacts and they all work with the dialer app open except two. For some reason if you have the dialer open and active when you hold down 'z' instead of calling speed dial 'z' you get a 't' in the dial string. Holding down 'b' gives you a 'p'.
Does anyone have any ideas on how to fix this?