invitation bug?

I wanted to invite a member (dukemper), but it did not work (I inveted someone else). Okay, I said, perhaps it was my mistake. Then I wanted to invite a newbie (yes, more and more RHP-users! 🙂 ) but I (or RHP) made the same error.
Is there a bug?
At RHP's or here in my room 😉

uups, sorry, I konw where the bug is: :'(
I wrote my fried's emailadress in the field, but I forgot to check the radiobutton.
Sorry! 😕