I recently bought an EF Motion Mount for my Epic and after our first shoot with it we noticed everything shot looks like it has the wrong white balance. We were shooting outdoors with WB set to 5600K and the image in the R3D's looks like it was shot at 3200K even though on the camera screen it was displaying correctly.
Did you ever figure it out? Sounds to me like some info in your R3D file got switched up, possibly in the camera. I've found monitoring REDs is damn tricky. I've had a similar thing happen during a test shoot, I decided later that I was shooting in the wrong color space "camera." I now pull a test file and look at it in RedCineX before shooting (time permitting).