Can someone explain what happened my last match? Or is it just a fluke result.

I was playing against an illegal formation. 3N-1-3N-3N. My players lvl is higher then his and I played 4-3N-2W-1, (V-style, with the DMC changed for a MC and arrows on the DR/DC) Obviously, my opponent got 20% possesion, he also suffered 2 injuries midgame but I still lost 1-0. Now I'm knocked out in the prelims again on conceded home goals. Shots were just 10-12 in my advantage. How is this possible, or am I missing something tactic wise?