I too am receiving incorrect mailers. I have "Automatically subscribe me to topics I participate in" checked in my settings.
I really only participate in the Home and Home Support forums. What I'm receiving are 2 different types of errors. One is a correct title of something I did participate in, but the post is from a completely different thread, like I saw a reply from an Uncharted3 thread, but it was under the title of a thread I posted in "Lame Contest" in the Home General forum.
The other error is the exact opposite. It shows a title of a thread I never heard from, having nothing to do with Home, but the reply is for a thread I did participate in, in Home General.
Quite odd. DG
Interesting feedback. We've escalated this to the webdev team. They'll poke around and see what's up with the what's up. thanks for raising this issue.
Update: This appears to be a Lithium-wide issue, and Lithium Dev teams are on the case. Thanks again for raising this issue.