I have found one interesting google ranking problem from Google webmaster forum. Check out: google.com.tw/support/forum/p/Webmasters/thread?tid=4d602ed1946b356e&hl=en Did anyone here has experienced this problem?
Well if it's a Geo-targeted then, it should not appear in proxy also, am i right? I don't think it's Geo-target problem.
You are correct. It is not a geo-target problem but the ranking across DCs issue. It is also depend which country that proxy is based. Example - if they are using US ip based then the results in USA may be different from other countries, even in the same Google.com.