Ranked bug?

Hi I just played a game, I queued for a ranked solo game and after going throught the pick and ban phase I played it out and won, at the end at the after game screen it told me it was a ranked game. I asked the fellow people of the game if they had the same problem and they all told me it was a ranked game I recived 0 lp for the game. I'm just curious of what happen and if anyone else had this problem