This can happen only if

- You got the torrent file from someone (ie passkey of someone else got passed to you_ , so download and upload will be accounted to that person and it will show under that person's name..

- Someone else was logged into DCT when the *.torrent file was downloaded..

Easiest way to find this out is, while you are dn/uploading that file. Go to that original torrent page... and look under download / upload section of that torrent .. and find out if you find some familiar name there..

OR may be admins might be able to find out whose passkey you used...

As this is not good ... that other person whose passkey you got should be more careful... passing on of torrents and hence passkey is not allowed in DCT...