Apex domains cannot have CNAME records.
Question and response
Question
dig cobranet.ro. NS
Answer
cobranet.ro. 5 NS ns2.cobranet.ro.
Authority
The response has no authority records.
Additional
ns2.cobranet.ro. 5 A 81.181.85.6
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0