I don’t know. I hit the button only ONCE. I think the trick is to CLOSE the window right after hitting the “POST” button. That works when posting PINGS at the DUmmie FUnnies but I thought that was a function of having a PING list of over 1000. So I guess when it comes to posting PING Lists, size does not matter.
It’s not just you. I get multiples on all my pings and I know some posters who say it happens to them on smart phones. Not that smart I guess. Someone had about 12 multiples post a little while back.