Thats what is happening, yes. is it designed that way or is it supposed to be two separate forms? in a previous release I used about 4 years ago I could have sworn the comments form was on a separate page from the actual posted comments. I was wanting them on separate pages but I can't find a way to do that.
That is the way it was setup when I took over in 2006. It could have been very different 4 years ago. In theory, the comment form is just html, the only thing it really needs is the comment id number.
You might be able to work something by using the template "entrycommentsform". Thats the template that shows the form for commenting. The "entrycomments" shows the comments for the entry. However, I am not sure where you would put it. Basically, each entry has a page and that page has the information to show the entries and the form for it.