You play with a legal formation. Even if you still have one guy injured there is still a long way to go for such a low quality team win over yours.

I see only 3 of your players performed at 7. Rest 8 of them performed at 5 or 6. So lets get the facts straight over here:
1. You played with a legal formation.
2. I assume every player played at his normal position
3. You offered a minimum win bonus

And still 8 out of 11 players underperformed ??? This is an obvious RNG slap on the face bro. You have been trolled I am afraid by the game engine. I have lost a few titles same way myself