Tricky to explain exactly. Sometimes the comment button goes straight to adding a new comment rather than the post’s comments. To reach the comments I have to press it again. But because it’s not consistent sometimes I have to press it several times to reach the actual comments.
The comment button is to leave a comment. To read comments on a post, you have to click the body of the post. The comment button works as intended; it’s just counterintuitive and not what you expect it’s going to do.