The line on Bran closed @ 1.2 on Bovada as the final was leaked. Likely a lot of volume on FreeBitco.in betting on the leaked result and thus the odds went down.
There was a lot of last-minute volume likely caused by the leak. The odds will change when a lot of bets pile onto one outcome close to the end which is why the estimated payout is just an estimate. We also got a lot of volume on the Bitcoin price at the end of May being above $6000. Which although it looks like a sure thing Bitcoin is capable of moving more $2000 in 7 days.