Apex domains cannot have CNAME records.
Question and response
Question
dig jolietparkdistrict.com. NS
Answer
jolietparkdistrict.com. 5 NS ns-619.awsdns-13.net.
jolietparkdistrict.com. 5 NS ns-1146.awsdns-15.org.
jolietparkdistrict.com. 5 NS ns-1232.awsdns-26.org.
jolietparkdistrict.com. 5 NS ns-400.awsdns-50.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0