The website does not work in Google Chrome (installed from AUR). It works in Firefox and in Chromium. It looks like a Javascript issue but even after enabling JS in the browser it still does not work. The sign-in and log-in buttons do not work (they are not clickable).
It looks like the browser is aggressively blocking your website’s CSP policy.
yh, I’ve disabled that extension now. I’ve had that for a while and still had been able to use the forum site but something must have changed on their side (CSP policy I bet) that’s recently caused the issue.