Active Directory Troubleshooting: How to Find from which Server a GPO is Created
If you didn't change the domain controller it will automatically point to PDC in all GPMC by default.
But in case if you are using different servers for GPMC and created by different Admins and you want to find from where and which server the GPO created use the below command.
repadmin /showmeta . "CN={insertgpoguid},CN=policies,CN=system,dc=domain,dc=com"
Check when created and originating DSA for that.