This is a weird one. I haven't quite figured it out fully yet.
After a moderator posts, the people who respond to the mod, are showing up with the little m next to their name, within the posts that they have responded with. Links shows bug
In this link, ONLY Greg Ellis is a mod. In the front page, he has the M by his name, indicating he is a mod. None of the others are mods. Click on the individual posts, in threaded mode at least, and you will see that the others ALSO have that same M by their name.
Weird. Never noticed it until today.