Apex domains cannot have CNAME records.
Question and response
Question
dig forum.serveroffer.lt. NS
Answer
forum.serveroffer.lt. 5 NS ns2.q1.lt.
forum.serveroffer.lt. 5 NS ns1.q1.lt.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0