@JimBobK
Please provide the information on the light connected to KS230kit so that we can further check the problem (brand, model, power, quantity).
Did you use Kasa APP or the physical button to adjust the brightness? Are you able to turn on the light with Kasa APP or physical button while it is on 100% brightness?
Is there anything unusual when the light is turned off? (e.g. flicking)