There is bug in the new member registration process.
This bug appeared after we paused registration and moved to the new forums in our initial test mode.
When a new user registers now (here), the registration processes completes (normally) but the "Registration Success" message does not appear in the registration feedback message.
However, the user can login.
I have already retired this code base and do not plan to fix this bug since we will be moving to a new forum soon.
Thank you for your patience.
One option is to disable new user registrations again here, but for now I will leave it "as-is" since we will get the new forums running again soon (we hope!).