PTR record resolves incorrectly.

[AartJansen]

I got my ISP to do a PTR record. initially it worked.
public IP to my.domain.
now it says its in error, and cloudron and my workstation on the same LAN resolve public IP to nextcloud.mydomain

I did add the nextcloud app to the cloudron install and give it the nextcloud hostname.

Externally the PTR record resolves correctly.

I thought my local DNS a bit misconfigured, not the cloudron server.
IP's & DNS server are assigned via DHCP. cloudron server is IP reserved.
My DNS servers are the ISP and a pihole.
On my PC when I do a nslookup <public ip> I can se the pihole log retrieve a PTR record from the ISP's name server.
I do not have any DNS records with my domain host set for anything other than my & * IE theres no nextcloud.domain
Is it pi hole? or the cloudron, I can't see any where on pihole where it would be getting nextcloud instead of my as a hostname... except the cloudron install.

[AartJansen]

@AartJansen It was pihole, I think. I tweaked settings, and flushed DNS, and waited, and the problems gone.

[nebulon]

thanks for sharing the root cause!