Hash fail means sources are sending corrupted chunks of data that your client rejects. That is Hashfails happen when bad data is received and the piece fails the integrity check.
It can never really be fixed, just wait for other sources with perfect files to come online.
And this is the reason why the downloaded file is a bit larger in torrents.
BMW X6 M Has All the Tuning Bits in Abu Dhabi
44 minutes ago