Is it normal that this website doesn't tell you when the poster is commenting?
Unless you choose to reply anonymously, it won't tell that person that you're the original poster of the question. So if it's not clear from context that you're the OP, you just have to explicitly tell them. Or if you want to make a comment, but not as a reply to anyone in particular, you just have to announce "I'm the original poster of this question". It's annoying.