looking at the screen shots theres a few things there like Potemy said, your formation could have been one of them.

other too, their GK sitting with 5 stars whilst yours only 2..

One thing is weird though, possession. I've had games i've won where my team was rated 25 against a team of rating 15, they've dominated possession 70% to my 30% yet I won... possession doesn't always mean your going to win, needs to come down to skills of scorers too, home ground advantage etc.