Apex domains cannot have CNAME records.
Question and response
Question
dig qfilter.eu. NS
Answer
qfilter.eu. 4 NS ns3.qweb.co.
qfilter.eu. 4 NS ns2.qweb.nu.
qfilter.eu. 4 NS ns1.qweb.net.
Authority
The response has no authority records.
Additional
ns1.qweb.net. 4 A 217.18.64.241
ns2.qweb.nu. 4 A 217.18.68.241
ns3.qweb.co. 4 A 185.214.149.241
ns1.qweb.net. 4 AAAA 2a00:19c0:a064:240:0:0:0:1
ns2.qweb.nu. 4 AAAA 2a00:19c0:c068:240:0:0:0:1
ns3.qweb.co. 4 AAAA 2a0b:9cc0:0:0:0:0:149:241
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0