We had automatic username generation which gave most users tetrian_{random symbols}. This was to make it easy to register but since then it has led to a lot of confusion around the users of the forum.

Because of that, we both removed this (so new users need to come up with a username themselves) and assigned random word usernames to most forum users.

This is an intentional change. You can change your username to anything you want by going to your Profile > Change Username.

Hope this doesn't cause too much confusion.