Uh, do you realize the other torrent has no leechers? You can't exactly send data to nobody. (Just realized you weren't asking about this)
And about your speed limit problem, there seems to be some bug in uTorrent that affects it. I've seen a report of the same problem before, where setting a download speed limit does nothing to limit the download speed. Try reporting it on uTorrent forums. Of course, see if the problem has been solved already first.