Apex domains cannot have CNAME records.
Question and response
Question
dig dev.oktawave.com. NS
Answer
dev.oktawave.com. 5 NS ns1.oktawave.com.
dev.oktawave.com. 5 NS ns2.oktawave.com.
Authority
The response has no authority records.
Additional
ns1.oktawave.com. 5 A 195.149.198.53
ns2.oktawave.com. 5 A 193.200.66.198
ns1.oktawave.com. 5 AAAA 2a03:d60:0:1:2:149:198:53
ns2.oktawave.com. 5 AAAA 2001:1a68:7:10:193:200:66:198
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0