Need Help: Weird Nameserver Issue w/Sedo Parking

Hey everyone. So one of my PBN sites is showing Sedo Parking (or sometimes nothing), but everything is set up properly (nameservers pointing to live shared hosting). Only 2 nameservers set in the Registrar. Yet when I access the site I get Sedo Parking or nothing, and when I run the domain on whois.domaintools.com it shows 4 nameservers: my 2 shared hosting ones + the sedo parking ones. How is that possible? Where could this error be coming from?

If you only recently updated the name servers, they may be only partly propagated.

You may want to log into your Sedo account, check for any Sedo name server records, and delete them.