If you installed any of those other samplesets *before* upgrading from HW 4 to HW 5 or 6, your rank routings would have carried over from HW 4 to HW 5 or 6 unless you chose an option to reset them
Installing a new organ usually requires going into Organ settings / Rank routing and sending each rank to an audio bus group. Your default audio bus group, which gets used automatically in Rank routing, might not be set up correctly to go to your headphones.
In that case, you need to go into General settings / Audio mixer and / Audio mixer bus groups to verify your settings for the default audio bus group is correctly done.
Or fix up Rank routing for each new organ you install instead of using the default. Load a working organ, look at Organ settings / Rank routing, and see which audio bus group its ranks are assigned to. Do the same for Caen.