What does Wasted and hashfails mean?
Wasted shows a combination of discarded data and bad data. Discarded data is data that’s sent to you by a peer that your client didn’t want. Hashfails happen when bad data is received and the piece fails the integrity check. Do not worry if this happens, since the data that fails the integrity check is discarded and re-downloaded. If you get an abnormal (hundreds of MB) amount of hash fails, it may be a poisoned torrent. If the torrent never finishes (gets stuck at 99.9% and has tons of hash fails), your router may be mangling the packets. Read this for further info.