Users don't register in league

Problem found!

This code for autologin was the problem:

function auto_login_new_user( $user_id ) {
        wp_set_current_user($user_id);
        wp_set_auth_cookie($user_id);
            // You can change home_url() to the specific URL,such as
        wp_redirect( home_url() );
        exit;
}
//add_action( 'user_register', 'auto_login_new_user' );

Does anyone know the reason?

My plugin also hooks into the user_register action. You can try setting the priority for the other plugin to something higher than my plugin, so that hook is executed later.

add_action( 'user_register', 'auto_login_new_user', 20 );