Same here, I was clearly the strongest team in the cup, I was +20% quality over the opponent and I still lost. Not counting the association matches where I was even +30% and had all the possession.
To me the game engine is totally busted and needs a rework. You have no control over the match. Whatever you choose as tactic, you see no change. Play through flanks or through the center? The players will still play the f**k they want. They never dribble, they pass the ball back when they are against the keeper, corner kick specialists not centering a single ball, free kick specialist not scoring and so on.
Something fishy is going on to me and a few association mates are reporting the same trolling.