After the top bar changes in the StackExchange.com, when a non logged-in user click the Sign Up button, instead of navigating to the corresponding page it displays the openid related code in the screen.
Screenshots for reference:
Sorry about that. I completely forgot about it when we were rolling out the new topbar on stackexchange.com, but signup works entirely differently there than it does on Q&A. We AJAX in the Stack Exchange OpenID signup form, and guess which route provided the URL to do so... :)
The issue is fixed in production now. Thanks for the report!