The Mist wallet, which acts as a solution for Both Ethereum and Ethereum Classic, contains a bug when dealing with Shapeshift transactions. For ETC users, the Mist wallet seems to be taking a cut for every transaction to and from Shapeshift.
Crypto*Digger RE: https://www.whattomine.com/ you can choose to search "profitability over 24h, 3days, 7days" also are you putting in your power costs?