https://meta.codidact.com/posts/287548

Posts have a link to allow you to follow (be notified of) new comment threads. On your own posts, you're following new threads by default -- but the link still says "follow new". That's confusing. When you create a post and are thus automatically following threads, you should see "unfollow".

Note: the check here isn't just "is this my post?", because if you explicitly unfollow, you should now see "follow new" like for anyone else's posts. I suspect that the automatic notification you get for new threads on your posts isn't using the "follow" mechanism (which was added later), and that the correct fix would be to use the follow mechanism and turn it on at post-creation time. But I haven't tried to understand the code, so that guess might be incorrect.