No, this isn't an illegal formation. If it was, possession should be 80%:20% - and that isn't.
Very interesting, why me defence isn't working against stronger teams... I won 3:2, but was much better, he scored 2 goals with 4 chances, my team needed 11 for 3 goals...
My defenders also were rated poor (5,4-6,3).
So this will be a hard second leg... which should be needed...
Against equal team, the usually performed well...