LED lights not turning completely off
There are lots on compatibility issues with dimmers and LEDs. LED lights are not as simple as the old incandescent lamps. They have little AC to DC power supplies (called "drivers") built into them because LEDs work on very low voltage DC power. Then there are literally dozens of different designs of "dimmers" and many of the electronic ones have what's called "leakage current" through them even when off. When used on circuits with resistive devices on them, like the old incandescent lamps, the leakage is so low that it is undetectable. But because the LED drivers are designed to be very efficient and the LEDs don't consume much power themselves, this leakage current is often enough to keep the drives and LEDs excited enough to "glow". 

The solution is to only use dimmers that say they are SPECIFICALLY designed for use with LED lamps. These will usually have a detectable OFF detent in the slide / rotary knob that is used for dimming. The totally electronic type where there is no slide or knob are the type that usually don't work to totally turn off LEDs. So you either change out the dimmer or learn to live with it.