I set up a register form like below:
[mb_user_profile_register id="sm_register"...] with meta boxes that I registered.
It works but the shortcode outputs the default register form AND the one that I entered in the shorcode at the same time. What may cause this?
By default, the shortcode [mb_user_profile_register] displays 4 base fields to register a user: Username, Email, Password and Confirm Password. If you want to create more user meta, you can add the meta box id to the shortcode.