Group Disbanded (Client)

Was just in a ranked pre-game lobby with a friend(Canni8al) once everyone selected their champions and the count down timer to go to the loading screen with the champion pictures reached 0, it backed me out to the main menu with a message that said Group disbanded. The thing is the game played out as normal, except for I was never allowed in the game or given a option to reconnect. P.S My friend won anyway.