Regular WHMCS page is still reachable

Hello,

I have recently switched to WPMUDEV's WHMCS WP Integration and it's working well for me already. I have one question though; my non-WordPress WHMCS page still seems reachable and it has an entirely different look than my WordPress site.

WordPress is installed on: https://www.orca.web.tr
WHMCS is at https://www.orca.web.tr/hesaplar

WHMCS seems properly integrated into my WP site, but when I visit https://www.orca.web.tr/hesaplar the vanilla WHMCS site shows up. Is there a way I can prevent that from happening?

Very Best,
Burak