It's a reply from a IPv6 address. Does the IPv6 address point to the correct host?
my ipv6 is disabled atm
your domain has an ipv6 - see https://check-your-website.server-daten.de/?q=serenityresearchcore.online
|Host||Type||IP-Address||is auth.||∑ Queries||∑ Timeout|
|serenityresearchcore.online||A||220.127.116.11 Weert/Limburg/Netherlands (NL) - XS4ALL Internet BV Hostname: 83-162-161-105.ip.xs4all.nl||yes||2||0|
|AAAA||2a02:2268:ffff:ffff::4 Amsterdam/North Holland/Netherlands (NL) - Hostnet Networks||yes|
And there are different answers:
Server: Apache/2.4.43 (Win64) OpenSSL/1.1.1g PHP/7.4.6
Doesn't look like the same machine.
Remove your AAAA record.
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