NOTE: The issue has been completely fixed since Plesk Panel 10.0.
Certificate from client repository was assigned on the domain. After domain migration from one Plesk server to another one, migrated domain has wrong certificate.
Plesk Migration Manager reported that migration was successfully completed.
CauseThis problem was discovered in Plesk 9.x.
Parallels Plesk Panel does not set up correct certificate for the domain after migration. Default server certificate is set up for the domain, instead of domain certificate. Real domain certificate is also migrated and it can be found in client repository.
To fix this misconfiguration change domain certificate manually for domain to the correct one.