Why some key word auto link to http://www.surfcanyon.com

Hi all, How do I stop the auto link to http://www.surfcanyon.com site for some key words.
This site has an auto link to surfcanyon.com also. If you go to https://premium.wpmudev.org/about/, in Richard Kiew description, you see vedio games key word link to surfcanyon.com site. Also in Barry Getty description, it has twitter key word link to surfcanyon.com. Any ideas or suggestions I appreciated.