confused with keyword analysis please help .

today i was analyzing the keyword and found a keyword with less compation using traffic travis and the setting for traffic travis was google US for compatition analysis and there was 4 pr 0 site according to Travis but when i checked for the keyword with google.com in the browser there was no pr 0 site and most of the site was having pr 4 or more. how come this is possible as i am not using any US proxy for TT and give me different result and when i used my browser with google.com

any one on this

i wouldnt put too much faith in TT data my friend