Hi, I had a similar problem with LEDs a while back, even though the X10 unit is switched it has a sensor wire on the output side to tell the unit whether it is on or off, LEDs seem to confuse the unit, try an incandescent load and see if it works okay, if it does I may have a fix for you, I would post it here but don’t know how to upload photos, try an incandescent and see what happens.