I see a problem:
nslookup -q=ns design.stanragets.com. 8.8.8.8
design.stanragets.com nameserver = ns1.example.com
design.stanragets.com nameserver = ns2.example.com
nslookup -q=ns stanragets.com. 8.8.8.8
stanragets.com nameserver = ns2.stanragets.com
stanragets.com nameserver = ns1.stanragets.com