Conflicting Nameservers

I just signed up. I read that I need to set the nameservers at my registrar to ns1.byet.org (ns2, ns3, ns4) which I did. My new account was created but on the sidebar the nameservers listed for the FTP are ns1.epizy.com (ns2).

Which nameservers should I be using for my registrar, the byet one or the ebizy one?

Either one works, both sets of nameserver addresses point to the same physical servers.