This might be something with my laptop, but recently when I click to post, I get a message saying that it is a duplicate post and I get redirected. The post still gets posted, so I'm not sure if my laptop is double clicking for some reason or something, but I'm just going to throw it out there in case anyone else has been having this happen.

 

Hi, magnet18
I have had the same problem before with my laptop, as well. For me it only happens if my internet connection drops or if my computer freezes. While trying to refresh the page, it tries to re-send the information. This would probably lead to the "double-post" notification, which I, too, have received on multiple occasions.
Der Strom