Sorry for doublepost, didn't see Rudy's last message...
From the lloks of it - there are three possibilities:
1) you accidentally switched the color (50-2-3 = 45 credits), and didn't change any card later (hardly possible)
2) you accidentally chose yellow at first and changed 3 cards (50 - 2 - 3*1 = 45)
3) you found a bug in color picking mechanism (which would be not good)
As it shows in the screenshot - Rudy really chose yellow.
But the results of this 'semi-final' are good:
You weren't beaten in yellow (17 vs. 0 and 10)
Opp 1 got through with red (19 vs. 8 and 8)
Opp 2 lost in blue with 20 agains your 28
In final Opp 1 had to win (though Opp2 had more points than Opp 1, but he didn't reach 'the final round').
EDIT: as far as I tested (about 50 times) everything works fine... The whole controlling thing isn't very comfortable, but hey, its just alpha