I'm having the opposite problem....
When my gmail contacts had synced with the phone, it managed to import contacts with similar names, like Pete Smith and Peter Smith - two totally different people, into the ONE contact. When I hit that contact on the phone, the two different phone numbers appear.
And another with similar names, Nick Jones and Nicholas Jones - this time it imported the gmail info AND facebook info into ONE contact. When I bring up that contact on my phone.. all info appears... all the email, phone, facebook info for BOTH.
I tried to alter the info in my gmail. Changed name, but all info still there as one. I tried deleting them and re-adding them, but still comes up as the same. Does anyone have any ideas that I could try?