Sometimes we see that one post in multiple times, it's happened unintentionally. Few days ago one of my post posted 6 times , then Andrei deleted 5 of them How to delete forum post?
See another duplicate post, I believe he did not do that intentionally
Problem with Powerhub theme
Problem with Powerhub theme
Problem with Powerhub theme
Here is the way to reproduce the bug.
Just do double clicks / multiple clicks very quickly on 'Submit' button. Topic will be posted multiple times!!