Interesting, you even paid the same amount so this idea wouldn't fix these duplicate comments. Any hints what you did that would help us reproduce? Was it on a bad internet connection?

edit: Oh, I see, it's a reply in a post where you are the OP. You don't pay spam fees in your own posts. That's why you only had to pay 1 sat for both comments even though they were replies to the same comment within 10 minutes.