Apex domains cannot have CNAME records.
Question and response
Question
dig realpromortgage.com. NS
Answer
realpromortgage.com. 5 NS ns2.realpromortgage.com.
realpromortgage.com. 5 NS ns1.realpromortgage.com.
Authority
The response has no authority records.
Additional
ns1.realpromortgage.com. 5 A 163.5.51.130
ns2.realpromortgage.com. 5 A 51.161.68.221
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0