I can't believe this hasn't been posted yet, as both my father's and my Pres are doing it (that's two out of the four in our family) so it must be fairly common. But I haven't found a thread:
When I dial voicemail I see the wrong contact. In my case, this contact became linked via Synergy to me. I have separated them, but this did not correct who shows up in voicemail.
In my father's case, the contact is not connected, but has the exact same phone number, albeit with a different area code.