Apex domains cannot have CNAME records.
Question and response
Question
dig jchost.jchost14.pl. NS
Answer
jchost.jchost14.pl. 5 NS ns2.jchost14.pl.
jchost.jchost14.pl. 5 NS ns1.jchost14.pl.
Authority
The response has no authority records.
Additional
ns1.jchost14.pl. 5 A 77.79.202.114
ns2.jchost14.pl. 5 A 85.232.237.114
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0