This is maybe a silly suggestion, but did you try scrolling down really far? The comments for a press release are way down at the bottom of the page.
The only other thing that I can think of is that if you see a (1) after your press release, in red, this doesn't mean you have a comment from someone else (at least from my experience). I think that the number there is counting the press release itself as a comment. If you see a (2) then you have 1 comment from someone else, a (3) means 2 comments, and so on.
I'm not sure if any of that is helpful, but that's all I can think of for now.