At the Aalto acoustics lab, we have measured a set of HRTFs recently with head tracking. We save a sofa file with the actual measured angles following the right handed coordinate system and thus they are not symmetric.
With the binauraliser, the plotted source directions seem to be flipped in the azimuth. The playback works correctly (left is on the left, positive azimuth), but it seems like the plotting of the directions only is flipped.