I have my profile here on the forums set up to subscribe anywhere that I post (with no email).
When I comment from the HWBot side of things (comment on a score or something like that), that translates to a post here on the forums. However, this post does not subscribe me to the thread, even if I was the first to comment and the thread is created in my name.
This makes it quite difficult to follow the questions and comments I leave on scores and the like.