Issue changed from subdomain to domain the wp installation weird thing Hacked?

[nikketrikke]

Server operating system version

ubuntu

Plesk version and microupdate number

the latest

hello happened a strange thing
i have a staging site as subdomain
and today
the link for the admin area of main domain is redirected to the staging site subdomain
while on frontend seems already and always works the main domain frontend site
so i'm not able to enter in admin area of wordpress
and i not know what to solve by plesk side the problem
i try some things switching server from apache to litespeed checkin for problems
not have idea someone can help me thanks