Thanks, Kaspar - that's where I am editing them - but I'm still getting that weird output. I'll try removing my test domain - resetting to default and trying again.
Forgive my ignorance here - I'm new to Plesk after many years in Cpanel.
I'm trying to set the default server-wide name servers - but I am running into an issue where the NS records for every domain are showing up as -
ns1.nameserverdomain.com.naemofhostedsite.com instead of...