If a user has a customer profile (i.e. ever filled out a shopping cart) the name in the profile is used everywhere their username is displayed.
This results in a lot of confusion for our moderators/admins. Because when they go to lookup a user in admin/people they're looking for the username that the user logs in with. But what's displayed is their "nice" name from their shipping address. I need to undo this override because it's way too confusing.
It doesn't look like anyone is doing this through theme_username(). Where is this display override happening?