Sensei friend glitch?

Whenever you look for Sensei in the friend search...







This pops up:

  




But if you were to look for Sensei%.....

This pops up:

                                                       The same goes for Rookie and Sasquatch



My theory is that before club penguin introduced Sensei, Rookie and Sasquatch there were already players with their names. So These players still exist.