you still have not set up your MIDI channels correctly.

Are you setting the split point from the controller or the module? In other words is the left hand transmitting on channel 2 and the right hand on channel 1? or is the whole keyboard channel 1? (in which case you need to set the split point from the Audya.)

Also, from the Audya, turn off everything you don't need in the MIDI menu RX page as already mentioned. once its all turned off you can start to re-introduce stuff as required.

If all else fails try setting the split point on the Audya above the top note of your controller - its a workaround solution and will probably get rid of the extra Piano sound, but your only curing the symptom, you would be better to set it up correctly now.