Do the lights vary in intensity or just one on high beam and the other on low? If it's just one on high & one on low, swapping when you press the dimmer, I'd suspect the wires are crossed. I did that very thing as a young body man many years ago and got the embarrassing job of rectifying my mistake.

Save a life, adopt a senior shelter pet.
The three main causes of blindness: Cataracts, Politics, Religion.
Name your dog Naked so you can walk Naked in the park.