Hi, In 2 games I was playing with a 5-4-1 formation.
Both of the times an MC was sent out with a red card, making my formation a 5-3-1, and I got possession 80-20% for my opponent, meaning illegal formation. Why??
I had wingers (both defenders and mid), I got 3 players in mid (ML, MC, MR) and 1 ST. All players in their right position.

So my formation was GK - DL DC DC DC DR - ML MC MR - ST
This shouldn't be an illegal formation, but twice I got 80-20% basically lost the games.