In Zynga poker sit and go: 25k starter
Villain dealt AA I'm dealt K9
Villain goes all in 25k I call 25k (all in as well)
Dealer flops K-7-9-x-7 (x isn't relevant and I don't remember what it was atm)
Zynga poker says Villain wins With AA-77 and I'm sent packing. Why doesn't my K9 beat him?