Apex domains cannot have CNAME records.
Question and response
Question
dig ns2.karasilver.ro. NS
Answer
ns2.karasilver.ro. 5 NS ns1.185-236-84-222.cprapid.com.
ns2.karasilver.ro. 5 NS ns2.185-236-84-222.cprapid.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0