The DEX for Qora Asset-221 BTCok and Qora is malfunction:
http://qora.co.uk/index/blockexplorer.html?block=826792
The selling/buying price is too small/big for the Qora software to handle.
Please don't try to sell your Qora to get BTCok.

If you want to sell your Qora, please use Qora asset-237 :
http://qora.co.uk/index/blockexplorer.html?block=826833

For your information, this kind of DEX is no DeFi, it is CeFi, I am the center. The SAT is a token I issue, you can covert SAT to Bitcoin's satoshi with okchai.