A sign-up not showing under my Party stats

[kylma]

That's right.
They say he came from the site's main directory, but I am quite confident (seen it myself from his browser logs) that the download was made under my tracker.

Has something like this happened to someone else?
Am I helpless against their claim that no tracker was used?

I only send a couple of players there, so I have no other motives to post this to you, other than the fact that I'm pretty pissed because I know this friend is gonna play a lot