The site has been infected with a pervasive but fairly innocuous looking piece of malware - it’s just trying to generate traffic for bikereviews.com. Google is now warning all users to the site that it’s infected - you may have seen the warning already if in a modern browser.
Therefore I’m going to have to spend a lot of time trying to untangle the mess, and will also probably be upgrading the forum software. Just an FYI if it’s running slow or doing weird things.
I will do my best not to delete the entire website.