Error in new user code

Some friends of mine saw me on this site and tried to join, but have yet to recieve their confirmation emails since they joined (one a few days ago and the other earlier today). I also noticed that when they registered, instead of saying something like, “Thank you for joining, TrkJac”, it said “Thank you for joining #username”, could this having something to do with it? Or is it something else?

Thanks in advance.