I have Lutron integrated to smartthings for about 2 years. Dunno why but since a week or so if i uses manually a switch it does'nt update in the smartthings app, but i can use the smartthings app to control my lights. In short if i use an automation to trigger when a specific switch is turned on then it wont happen as the light will turn on but the smartthings switch according to this switch won't.