I am having the same issues. My Torrents has an upload speed while I download but immediately becomes 0kb once completed. I tried stopping them and restarting, recheck it and even using other clients, like uTorrent and my upload speed is always 0kb. Even though there are some upload speed (~30kb/s) while I download a file, my ratio is still 0.000. And now with my downloads completed it's not uploading anymore.

Any ideas as to why it only uploads while it is downloading?