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LZW36 Fan/Dimmer Switch Humming

I installed the LZW36 this past weekend, and I must say I love it and it checks all the wife’s boxes for a switch.

An issue I am noticing is that I hear an audible high pitch “humming” sound when the lights are dimmed. It is not audible when the lights are off or when they are at 100%. It is coming from the controller box. Could I have wired it wrong, or is this expected behavior?