I've noticed it on several occasions recently. Is it a rather unsubtle "bump" for the thread, a mistake they've made when they were replying, or what?

It's not as if there isn't an edit button, so they can amend their reply if they fucked up, or haven't they noticed they can amend/correct their mistake? :undecided:
Whatever, it pisses me off no end

Can anybody provide a credible explanation or is it just me who's irritated by it?
:confused: :confused: :fuckinghell: