overall speeds do not match speed of one single download

Hi all. I currently have one torrent running at 100kb down/ 60kb up, and this is the only download running at the moment.

However the overall download sais 130kb/sec, and the overall upload sais 75 kb/sec.

So I wonder where those 30 additional kb are going to… Connections maybe? Or is it somehow calculating my other activities into the overall value? Not that I am aware of other activities that would require 30kb up/down :blink: