Not sure if it was just me, but...
I just applied a comment, and it ended up against a different answer.
The answer that the comment ended up against didn't have the code in it that I was commenting on, and didn't show that it had been edited.
It may be that the answer I selected originally had been deleted as it wasn't on the list of answers any more.
The question involved is here: Later-inserted tags not seen by JQuery, and the answer that ended up with the comment was eyurdakul's.
Could there be a bug here (it may just be me and not enough coffee this morning)?
Note: the comment is no longer there.