Ahm... what?

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Sonnenblume is the old account of my wife, I "play" - I trained the team at the morning. ~4 hours before the CL game started, she had the league game. I logged in a few minutes ago, the train the subs... and saw that result.
First, I thought about illegal formation, but oppo-manager was there (you see the sub). Also a FA-member watched the game, I talked to him, and he said, Opponent changed one time formation...

So... what? Unattended 10% weaker, tired (maybe ~75%) wins 7:1? Btw: my own team won only 5:0 at league against 40% weaker team, 11. place, unmanaged...
Sometimes this game is so redicioules.