When looking at the new posts list, I often see a small image of my avatar next to a thread that I never responded in. So I'm thinking this is some glitch.
ghost in the machine ??
It's been mentioned before and we don't have an answer for it.
I have just started seeing this within the past couple of days. Today my avatar was inserted on a brand new thread that was started after the last time I logged in.
As another data point, I use Private Browsing in Firefox, so I have to log on every time I visit RR. No persistent login.