All instruments play on all tracks when using rack loaded with kontakt – Tracktion Forum

I am using kontakt plugin loaded with three instruments (NOT DRUMS). when i play each track separately all three instruments play together on all tracks, I have set up the required number of tracks in kontakt, and used th rack function which appears to be wired correctly. How do I set each track to play an individual instrument when using one instance of Kontakt with three instruments loaded into it?