Who knows when Bitrex will charge BitcoinPrivate? In the list it appeared but the accrual was not yet. Who then what did you get?
People having Zclassic on Bittrex were credited with Bitcoin Private. They didn't treat same way those having Bitcoin in their wallets. That's why it appears there but they have shown no interest in opening its trading market. Who knows if there will be any change in their stance in future.