It appears that your dimmer is not fully compatible with these bulbs. Even when the switch is off, there is a small amount of current going to the lights which is causing them to stay on. LEDs run on very low wattage and are very sensitive to power. It doesn’t take much energy for the diodes to give light.
I would suggest exchanging your dimmer for one of our preferred dimmers, for example the  LUTRON CL.
Hope this answers your question, 

Thank you

-Luminus Customer Service Team