Actually, this thread from Crackberry seems to cover this topic a little bit more. Seems to be an issue with 10.1 whereby the same number within multiple contacts OR non-linked apps like FB add to the mix of issues. Apparently you want only one number assigned to one contact or it will just give the number w/o the matching contact info. Since I don't own this device, I can't vouch for its validity but it seems accurate if everyone is pointing to the same temp solution. Obviously an update is in order from BB to address this (one would hope).
Q10 Caller ID Issue? - BlackBerry Forums at CrackBerry.com