New sensors have a neutral line instead of using a small trickle of current through the load to power the sensor. That technique worked great when the tungsten would let some current through without any effect, but those days are over.You are using an incompatible dimmer, CountryBoy. I had the same issue with my garage. I installed an occupancy sensor to turn the lights on/off automatically. But when the motion would turn off, the LEDs (and I think the CFLs ) would continue a weird, dim glow.
I had to add an extra load to fix it. (I changed one bulb to a 40w incandescent and they stopped)
That's why every switchbox should have a neutral run to it. I think that's code in the latest NEC.