pie-register & Membership2 made Double registration forms

I made a registration form with Pie register.
On my child theme's functions.php, I wrote the filter
add_filter('ms_frontend_handle_registration', '__return_false':wink:;
And I selected Pie register's registration page in the M2 setting page's "Register" menu.

But M2's registration appeared after the Pie register's registration Custom form.
Yes. It's Double! Why?