Yes, I'm guessing it's a software problem and not necessarily users, and I know mods sometimes take care of it "manually". If it's hiccups, this software is sick! The problem is the dupes don't always fall directly above the original, but can be several lines above it, and I end up posting to it only to find the original already has replies. The problem is so prevalent that I now spend time scanning the forum list just looking to see if it's a dupe post before even replying. If I happen to reply to one of the posts, I try to tag the other one with "Dupe post" and a link to the post just as an alert, but it gets tiresome. Also, since I spend time in the Unanswered threads forum, if a post happens to have a dupe and one of the dupes was replied to, and moved/tagged to the appropriate forum, then the other dupe post is left in the Unanswered threads forum with 0 replies making it seem like it's a non-duplicate posting.
I know I'm preaching to the choir as I'm sure you're all aware of the problem. I'm just bringing it up so someone can look into it and finally fix it. I belong to a lot of forums (computers, photography, auto, etc) and have only seen this on AC (Mobile Nations). Us engineer types don't like to live with broken stuff!
Just bringing it up.