If such situation occurred, most probably you tried to visit the web site during the period of updating information about dns-servers. In that moment root servers contained outdated information, and dns-servers of your provider recorded it into a cache memory and will refer to it for some time.

Other Internet-provider you are using can already display correct information. By the way, it will be useful to clear the cache memory of your computer using ipconfig / flushdns command.

If you are running Windows, go to “Start” menu – “Run…” – cmd - ipconfig / flushdns.