WHMCS subdomain not redirecting to domain

[Root4]

Hello,

 

I have installed WHMCS subdomain https;//portal.example.com/  and when i go on page and  then "home" it doesnt redirecting to domain https://example.com.

In General setting:

Domain: https://example.com

WHMCS System URL: https://portal.example.com

In configuration.php i dont use any redirection or new paths

 

Searched in community but didnt found solution.

 

Thank you