Mottled leaves underside - Cattleya

[Nexogen]

I want to tell you that you involuntarily have stressed the plants (moving from the greenhouse to your house), you have changed the way of life of these plants.
For this you have to wait for the plants to be accommodate with the new owner ...
If somehow you have disturbed their roots, you have applied extra stress.
In these pictures you can see that the plant is dehydrated, probably due to lack of roots. You have to wait, probably until the next vegetative cycle. I give you a advice; do not watering the plant too often. Watering, under the current circumstances creates more problems. You only need to keep the plant at high RH, only in this way it can re-hydrate itself.