Sometimes, HB is a little bit slow to add our replies to threads, so it is quite a temptation to hit the Add Reply button again. When you do this, a duplicate post will appear in the thread. I have seen this occur from time to time, and not everyone knows how to fix it themselves, but it is really very simple. All you have to do is hit the Edit Post icon (the little notepad with pencil) above your post, and when the editing page comes up, check the box in the upper left hand corner that says "Delete Post." Then click the Edit post button under the text box, and when the thread comes back up, your duplicate will have been deleted!