Apex domains cannot have CNAME records.
Question and response
Question
dig stwmg.com. NS
Answer
stwmg.com. 5 NS ns35.worldnic.com.
stwmg.com. 5 NS ns36.worldnic.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0