I think some prices in china are due to the withdrawal issue (you can withdraw in cash, not in btc - so you sell the btc to get your cash).
Not sure if they've allowed normal withdrawals.
This case is long gone, btc withdraws were blocked only on okcoin.cn not okcoin.com, and the block was shifted like a month ago.
tell that to the chinese. by the looks of things they're all still waiting.