- Plesk 12.5 for Linux
- Plesk 12.0 for Windows
- Plesk 12.0 for Linux
The first NS server that is specified in Tools & Settings > DNS Template > ns1.<domain> is not a primary name server in SOA record.
Changing of any NS record in DNS Template and then applying changes to the existing domains leads to changing primary name server in a domain's zone file.
This is Plesk bug with ID #PPPM-2226 which will be fixed in future micro-updates.
As a workaround: