Im constantly seeing the message.
"you've already posted this, duplicate, refresh".

Yet its false, when I refresh, my post is not there.

Im a genuine user trying to contribute to the forums, but feel its a pointless waste of time as my posts and threads dont show, or I get a message like above or "wait 360 seconds", only to wait and then get a message "already posted"

Surely you are losing many users over this?