I just checked the blockchain.
Essentially all the new blocks are almost entirely going to this guy:
KRNboASVYKYMuH1ivzq5aqLWFfTebLwF3K
Is he a huge solo megahasher and the pools are misreporting the actual network hash? I hope so...
That would make sense.
BTW, I saw how your pool was practically taking every other block just before 66600, from looking on its website. That was a big difference.
It's also worth noting though that all of this guy's coins were moved to this account:
KDJ9B3MedQwdkbKUGnhTbBvq27duXBCv9i
Where it has been untouched. I don't think this is behavior multipools would have. But man, this guy would have to have like at least 500mh/s under his control to be able to do what he's doing, pretty crazy.