Left during Queue but the Game Started Anyways?

I left during queue right before the game started because my team picked three midlaners and the game started anyways. I've done this before and haven't had a problem. I should also note the loading screen did NOT start before I quit.

http://matchhistory.na.leagueoflegends.com/en/#match-details/NA1/1827955476/36505219?tab=overview