Dude is your client pointing to pfsense for dns?? if you have forwarder enabled in resolver it will forward to where you tell it to forward.. If your using the forwarder then it will forward to where you set it to forward..
If your client is not pointing to pfsense doesn't matter how you set pfsense up..
Please post up your setting in pfsense, and your settings in your client showing what dns its using.. simple ipconfig /all in windows machine.
Here took all of couple seconds to switch over and test this.. See attached.. Make sure you clear your browser cache and your machines local dns cache.. Reboot the machine if you do not know how to do that..
If you do not disable dnssec and you forward to opendns your prob not going to get anything back since they do not support dnssec.. That should be disabled if forwarding to opendns. See screenshot.