ns3.site.pro has no CNAME records.
Question and response
Question
dig ns3.site.pro. NS
Answer
The response has no answer records.
Authority
site.pro. 300 SOA ns1.site.pro. support.site.pro. 2026022601 1200 300 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0