[Gameplay] Game not showing in official match history, game showing on OG.GG

So here I have a picture of my Riot Games Match History, and my OP.GG Match History. Why have I not gained my LP for this obvious victory?

I usually wouldn't make a fuss, but I'll probably be demoted if i lose my next game, and if I get the LP for the victory (usually 20-21), I won't be demoted if i lose my next two games. Can a rioter please help me?

Edit: my OP.GG: http://na.op.gg/summoner/userName=Fiku