hmm well u have done something wrong

because when u download torrent from dc and load trackers in the torrent which u already have in your client

u will see new tracker with your passkey in it.

passkey is a unique key assigned to your account which tells us seeding is done by u and we have to credit the amount in your stats.

till you dont the passkey in your torrent consider it to be unregistered

for easy understanding remove the torrent from the client and delete it
download from dc open in client give location to it where your data is stored on com it will check for %age availablity and if check goes to 100% it will start seeding.