Apex domains cannot have CNAME records.
Question and response
Question
dig coolbuy.ro. NS
Answer
coolbuy.ro. 4 NS ns2.afacereazilei.ro.
coolbuy.ro. 4 NS ns1.afacereazilei.ro.
Authority
The response has no authority records.
Additional
ns1.afacereazilei.ro. 4 A 37.156.67.73
ns2.afacereazilei.ro. 4 A 185.88.28.185
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0