Do u have a illegal formation? Cause that almost happen to me. My team is 30* against a 18*. 1st half i was playing an illegal formation, apparently, and was losng 2 nothing. With only 20% possesion. Luckily i start watching the game and did some changes.
Illegal formation can really hurt u. I tied a 2ndleg game against an inactive player with lower quality than me and which i had beat first game 6-0. Just becuse of illegal formation.