I've been (quickly

Now the bug : Transmission keeps increasing my upload rate. I was limiting the upload rate to 30 KB/s, and you can see in the menubar that the upload rate was respected (it was around the 30 KB/s unlike what Transmission reported) :
I noticed that every second, or 2 seconds I didn't check for sure, the upload rate increased by 20 KB/s. After suppressing the upload limit, nothing happened. And setting the upload limit back (as I expected) didn't change a thing. So I had to restart Transmission for this bug to disappear.
So is this bug known ? Should I report it to Trac (as I've registered to this forum, I'm not enthusiastic to the idea of registering again so if one want to do it, don't hesitate) ?