sounds to me like maybe you are trying to give a guest network an ip range that your VPN provider is also issuing? (strange guess). Or another possibility would be adguardhome doesn't have that network range
10.0.0.0/8properly configured as a private network it services, but it does have
192.168.0.0/16configured to be a private network range it services.
No VPN setup.
I’m using 10.12.12.0/24 for my main network and that works fine with no issues. It was just the YazFi network that was being strange (10.12.13.0/24).
Interestingly as well after the change, devices have maintained the final octet in their IP addresses - for example 10.12.13.7 has become 192.168.12.7, 10.12.13.10 has become 192.168.12.10 etc.
I guess this is by design in YazFi?