Cannot see friend from facebook on the friendlist(we are both connected). Please help

I have connected to my facebook and i cannot see one of my friends on the list. We started playing together, and we cant even play friendly matches because of that. I have invited him to the game, and i cannot see him on the friends list. When i go to his profile i cannot even manually add/delete him. I just dont have Green "Invite" sign and red "Cross" button. Nothing there.... How to fix that? We are both connected to facebook. Is there a place where i can report that bug? Its really annoying, because we started playing to play together and we cant even do it...