Apex domains cannot have CNAME records.
Question and response
Question
dig lan-vg1-1.static.rozabg.com. NS
Answer
lan-vg1-1.static.rozabg.com. 5 NS ns3.rozabg.com.
lan-vg1-1.static.rozabg.com. 5 NS ns2.rozabg.com.
Authority
The response has no authority records.
Additional
ns2.rozabg.com. 5 A 193.151.80.14
ns3.rozabg.com. 5 A 193.151.80.3
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0