BuddyPress.org

WordPress version: 5.8.1
BuddyPress version: 9.1.1
link to your site: https://e-seeker.com/
Hi,
E-Seeker, allows users to register accounts and create their website, as part of a multisite environment.
The problem occurs after registration, where the user is added on the main site as well, as seen in the print screen:
https://prntscr.com/1s5dubh

I also added this code to manage to prevent the user to have access to the main site:
https://prntscr.com/1s5anwd

When I disable BuddyPress, and sign up a new user on https://e-seeker.com/wp-signup.php, I have a smooth registration, without the user added to my main site;
https://prntscr.com/1s5e8tw

I would appreciate any helpon this matter, so that a user could register an account or a website without be added and have access to my main site.