Strange behavior Pfsense + opendns

[fasi74]

Here is my network
Pfsense contains three wan interfaces and one lan interface
Pfsense host configured to use opendns dns servers
Local client configured to use an active directory integrated dns server which also forwards external name quires to opendns name servers
Content filtering working

Next i setup a Web proxy server on my lan to allow someusers to bypass opendns and that proxy server is configured to use other dns server on internet like 8.8.8.8 etc

Now this dont work and proxy server is also sent to opendns servers somehow..
The firewall rules have no restrictions to block any outbound dns traffic.
What am i missing?