The only way to make that work is for us to send the "no-cache" pragma with the page, which would prevent any of the bulletin board pages from being cached by your browser, ever. We will not do that as it would place a whole new level of performance burdens on the server and the client.
If you want the page to automatically refresh, you would need to disable caching, in your browser. As it stands, your browser is not asking for a new page when you go back. It simply redraws it from the cache and the server is not involved at all.