nc1.php.net ip address change not propagated on nc.php.net

Hello,

I've migrated a few days ago our New Caledonian PHP mirror to a brand 
new server.

Our mirror name is nc1.php.net aka php.nautile.nc

DNS give the following results

nc1.php.net.        3600    IN    CNAME    php.nautile.nc.
php.nautile.nc.        3600    IN    A    103.2.186.80
php.nautile.nc.        3600    IN    A    103.2.186.81
php.nautile.nc.        3600    IN    AAAA    2404:e400:c::443:1
php.nautile.nc.        3600    IN    AAAA    2404:e400:c::443:2

All is OK for the following names :

http://php.nautile.nc/mirror-info
http://nc1.php.net/mirror-info

and with the geodns view, www.php.net give :
www.php.net.        163    IN    A    103.2.186.80
www.php.net.        163    IN    A    103.2.186.81
www.php.net.        156    IN    AAAA    2404:e400:c::443:1
www.php.net.        156    IN    AAAA    2404:e400:c::443:2
www.php.net.        156    IN    AAAA    2a02:cb41::7

(the last one is a bit strange, because 1 of 3 requests in IPv6 on 
www.php.net will go outside New Caledonia)

But the main problem is on nc.php.net :

nc.php.net.        3600    IN    A    115.126.160.110

This is the old IP of nc1.php.net mirror ! And after few days, these IP 
don't seem to want to be updated to new IP.

The old mirror is still up, so no requests are gone : 
http://nc.php.net/mirror-info

And there is no AAAA record for nc.php.net....

How does nc.php.net could behave like nc1.php.net or like www.php.net?

Have I missed something?

Thanks for your answers.

Best regards,

Nicolas Aupetit - Nautile