Possession means nothing if you don't do anything with it.
I know but why was he getting the 20% possession while his opponent should have got that.
@OP Can u please post a screenshot of the match report for us all to see and tell what is wrong if anything is wrong at all.
U r playing only 2 Defenderrs when u need to have at least 3!!! That is where u have gone wrong. And ur opponent does have STs, that too 2 not even 1. U had the illegal formation, his was lethal, so u had to had 20% possession and logicaly u had to lose.