As of today, all redirect page loads after submitting under /energonpub are appending port 80 to the host name (
https://www.seibertron.com:80) which is causing Chrome at least to block the page as insecure ("can't provide a secure connection" / "invalid response"). The initial confirmation page loads OK, but the redirect back to the forum post then has the problem URL. I can't test whether this is happening anywhere else on the site, but it's definitely happening on the Login, New Post and Edit Post pages. Forum links (threads, pages) in general aren't doing this, just when submitting a form.
I presume it's something that changed today, as I was automatically signed out and it's been happening since then.