When we started this newer forum, I was horrified to see my password up there!
Well, for some reason I had a differnet username when I first joined here, and then used the change (displayed)username option to my usual tag. And later used that as a password.
Thus as I understand it what is shown there is the "real" username as used for the first login.
Along the same lines, this original name is still used on the Playground, so "my" article is not shown as made by Msquare.
(And I have changed passwords since.