Apex domains cannot have CNAME records.
Question and response
Question
dig wwwlibertychecks.com. NS
Answer
wwwlibertychecks.com. 1 NS ns-844.awsdns-41.net.
wwwlibertychecks.com. 1 NS ns-13.awsdns-01.com.
wwwlibertychecks.com. 1 NS ns-805.awsdns-36.net.
wwwlibertychecks.com. 1 NS ns-2012.awsdns-59.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0