FAP Upload Meter Gone Crazy?

[luomat]

On 12/01 my "Actual Usage Upload" for the past 30 days was 2,343 MB.

Today (barely 12/04) it's 858 MB.

Am I seriously supposed to believe that I **unknowingly** uploaded almost 1500mb in two days sometime last month?

Or is it more likely that something went wrong with their FAP meter?

(I'm running an all Mac household, so there's no spyware-ridden zombie Windows machine on my network, and the wireless is locked down with WPA2, so there's no one else piggybacking on my connection. And there's no P2P usage here.)