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You are describing a faulty multifunction switch. The switch is bad inside the turn signal stalk where the high beam switch is located.
Give it a swap and the issue should resolve.
How it should be is low beams stay the same and when you click the switch, high beams come on as well. Your switch is broken internally and crossing the light wires instead of changing them.
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touch, smell, hear the vehicle/machine in question. Please provide as much detail as possible and I will provide as much back.
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