Stressed from the travel for one. Also check for spider mites (look under the leaves), sometimes it happens that they travel with the plant. A good spraying down with water should clear that up.

Don't spray with anything else until the plants settle in. Since they were stressed from the trip, they didn't need the added stress of the Orthonex (I'm assuming Orthonex, the combo insecticide/fungicide instead of Orthene which is just an insecticide).

2 - 3 hours of sun isn't enough. But, you do have to harden them off before exposing to full sun by gradually exposing them to sun, about an hour or two a day until you don't see any damage. If put out into direct sunlight too quickly, there can be burning.