I thought you had space problems Hollow..
About the tracker.
Each account have a password wich identify you as a user. Go to
http://www.boxtorrents.com, click "Profile" and look beside "Torrent pass". This is youre password for accessing the tracker. I guess this is what will "confuse" the tracker if 2 computers tries to use the same password. (someone correct me if iam wrong)
If youre gonna transfer all ure files to 1 computer check the torrents before you seed, under "trackers" makes sure you have the same password.
If you have a different one you dont get upload credit, and iam not sure if its allowed ether.