OP, it looks like you have a wiring error, and there is probably a slight difference between the to lights even though they look the same, and this is causing one to stay on dimly. If you KNOW what you are doing, I would turn off the breaker, and trace all of the wiring and correct the connections, then test the lighting. Basically, all grounds bonded together. All neutrals bonded together. Black HOT wire from source to switch, and the black wires to the lights on the switched side of the switch.
I have equipment to help if needed.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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