DNS issue.

[assaf]

i have a really weird issue im not sure how to address…

i have pfsense hostname as "firewall"
and domain "office.mydomain.com" (used my real domain)
dns servers are google's
8.8.8.8 and 8.8.4.4

i have dns forwarder enabled with the following configurations:
Enabled
DHCP Registration: Enabled
Static DHCP: Enabled
interfaces: ALL ( i have 1 lan two WAN )

Problem:
1. some domains mostly co.uk dosnt work - i dont get DNS for them, if i change my dns server on my local pc directly to 8.8.8.8 - works
2. when i use nslookup for example to query domain.com i get:
name: domain.com.mydomain.com instead of just domain.com and the address: 127.0.53.53
weird problem as when i change on nslookup server configuration to 8.8.8.8
i still get the same name and ip, what am i doing wrong ?