Seeding is the process of upload data to others, to help them complete the torrent download. The 'whole bit torrent thing' works this way; people upload/download data to/from each other. If your 7G includes upload bandwidth, then seeding will 'eat into' your usage limits. You can set a transfer limit (ie. 6.GB) by opening 'Preferences' (CTRL-P), navigating to 'Transfer Cap' and enabling (+configuring) the transfer cap to suit your needs. Alternatively, you can prevent seeding by stopping the torrent.