This is one of the experience I had before in T1. Not sure what card it is but its courage based ability is + ?damage.
So in the last round, it's supposed to do the original damage but it somehow performed the ability too and changed the outcome of the game.
Mind to explain? just a glitch?
Courage means that if the card is played first, it gains its ability.
You're thinking it only to first rounds.
So if Filomena was your opponents card, and it was his turn the final round, Filomena's damage would be 5.
If it was your turn in the final round, Filomena would do the normal 1 damage because your opponent did not play first.
Hope that helps!