50 satoshi per byte fee is not "more" than enough anymore, but high enough to get your transaction in the next 20 blocks or so. Problem is there's only 12 blocks since 3 hours ago and the latest was 1 hour and 12 minutes ago (which means that you're unlucky.). So your transaction should be confirmed within 6 blocks (or 1 hour average).

Edit:
Whoops. Terrible math in action there. I meant 8 blocks, not 6.