Yeah, seems to be issues with inviting friends into games and the usual friendlist delay problem. I guess the best thing to do is to wait patiently, I am sure that Riot is working on the issue at the moment.
EDIT: Seems that there is a general delay for every action you do in pvp.net. If you create a game and invite people, it will take a few minutes until everyone even gets their invites. My friend just logged out and logged in, and now suddenly his status changed to "Creating normal game", even though he has not created a game. The last game he created and cancelled was 10 minutes ago.