I have some friends I'd like to invite, and they're in the area where you can click to invite them, and when I do it says 'thank you for your suggestion', and then the persons' steam icon goes to 'invited'. However when I close and open the invitation section, they reappear in the able to be invited area, and I don't know if it actually is sending them invites. It doesn't happen to everyone, it's seemingly at random. I think I have maybe seven people this happens with? Hope you can fix it! 
