Noel, that's actually pretty typical for sends in nearly any DAW. I'm talking about the output of the reverb itself being limited in spread to a certain pan 'section'. Just because you pan the input to a reverb, does not limit it's output to a certain band of the left to right pan - in fact, most reverbs intentionally do quite a bit of mixing of the signal to simulate what happens in a reverberant space.

Bob, when you listen to this, does it seems to limit the ambience output to a 'section' of the L/R space?