DHCP Leases not showing internally set domain/FQDN

Hello, bit of a random question here, and whilst everything seems to be working, I'm more so curious as to the possible configuration difference.

I've been running my ER605 v2 for almost a year now after swapping out my old 1043 router.

Have recently managed to encourage my brother to replace his router too, so have set this up with OpenWRT with pretty much a like for like configuration with different local domains of course.

My DHCP leases look like this:

Whereas my brothers don't show the FDQN domain appended:

Anyone know why? I'm still running OpenWrt 23.05.3 whereas my brothers is OpenWrt 23.05.5.

Cheers

Sussed it out, DNSMasq was set to ignore the resolv file, I unchecked this, and now the leases show with the FQDN appended. Have now set it to ignore again now, and the FQDN is gone. Although my DNSMasq is set to ignore resolv, and its still there?

Can't remember why I set resolv to be ignored, might be something to do with DNS Over HTTPS?