A junction box has 3 wires, a hot, one running to a porch light, and another feeding 4 l.e.d. lights. It uses a stacked single pole switch which was changed out last week. At first everything worked well, but now it's not. At first I thought it was the switch, so I used one single pole switch on each line (porch and l.e.d.) individually. This is what is happening. When l.e.d. circuit is switched on only 3 out 4 lights come on. And when patio switch is on patio does not turn on (bulb is good) and all 4 of the l.e.d. lights come on but are very dim. Please help.