BuddyPress.org

Hmm, that’s strange. It’s working for me exactly as advertised.
What’s the history of your theme? Is it default, child, custom etc?

Maybe cookies…
In the Admin, set “let user decide” for some fields.
Log out.
Clear your cookies, make sure to delete all cookies from the domain, and from any test domains, and any local domains (eg. mamp wamp etc. if you’re using that) that you’re developing the site on.
Log in as a subscriber level user.
What result now?