Question is: how many times this happens in real life?
I remember this one time: "Manchester City 4-3 Tottenham Spurs in FA Cup Fourth round 2004. Spurs took a convincing 3–0 lead into the break after goals from Ledley King, Robbie Keane and a Christian Ziege free kick. However, after the break, goals from Sylvain Distin, Paul Bosvelt, Shaun Wright-Phillips and Jon Macken in the 90th minute sealed a victory, attributed to the "magic of the FA Cup."

And in these 3 years it has happened before! Like 2-0; 2-3;
And furhtermore if you are present at the game, how can you prevent/foresee something like this ? When you're opponent is switching GK's ?! C'mon is was not only abt the end result! My team was 99% full on Energy and Moral.
Its a glitch and the simulation is trying to compensate somehow the difference between teams. It was just too stupid for a human to assist. Maybe from a machine pov it makes sense. Not to humans, sorry. Or maybe the game was "Fixed" like in real life..lol