Apex domains cannot have CNAME records.
Question and response
Question
dig grannyhearts.com. NS
Answer
grannyhearts.com. 5 NS ns-1340.awsdns-39.org.
grannyhearts.com. 5 NS ns-621.awsdns-13.net.
grannyhearts.com. 5 NS ns-738.awsdns-28.net.
grannyhearts.com. 5 NS ns-1496.awsdns-59.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0