You counted wrong.
From the picture, two gold towers down = 400 points. First tower missing 2 shields = another 100, so 500 total. That's, at minimum, 8 wins (well, attacks).
To get the next 450 points from non-gold towers, you need 4 full towers and the first two shields on a fifth. That's another 14 wins.
22 wins compared to the 13 you stated.
How many people are in your guild?