Hi all.
I was playing a cup match, with "normal" ball possession of 60% in my favour, with this formation:
4-4-2 with the midfield line being DMC - 3 MC.
At one point I substituted the DMC with a striker (I was losing 1-0) and out of the blue the ball possession went 80% in my opponent's favour.
In a blink of an eye he scored 2 goals until I put back a DMC in lieu of a striker.
No website says that's an illegal formation!