Some of my contacts are 1/2 missing...?

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http://androidforums.com – Hi, I just got a new phone (galaxy ace 2), and some of my contacts are missing, when I first used the phone and signed into my google account I thought all my contacts where there, but they're not, a few are missing from the list. BUT when I type the missing contacts name into the text message "to" box they come up, with picture and everything... Does anyone know why? And does anyone know how I can wipe the google synced contacts and start again? Thanks (General)