07-05-2013 23:30 - edited 07-05-2013 23:31
The fields probably does not match. It also happens to me when I sync my Google contacts on my iPhone 5. (I also own a 620). On your Google contacts, try to use the default labels e.g. Home, Mobile, etc.
I have more than 1000 contacts and can not modify the details of each contact manually. Is there a way to fix it. If microsoft is thinking about catching the market share, they should make the migration smooth so that people dont have to regret.