This is the default page that new users are directed to to activate their account after registration. If they don’t use the link in the email to activate their account, they can go directly to this page and put in the code to activate their account.
Having the same exact issue. Wish I knew what was going on. BBPress name doesn’t seem to want to take upper case letters, and it’s not updating the user. If I manually go in and set the proper display name for a user, if they edit their profile it gets reset.