Doorbell chime box vibrates

I just installed the doorbell yesterday and tonight my wife heard constant buzzing that was coming from the doorbell chime box, as soon as I disconnected the wire from the doorbell the buzzing stops but it also cuts the power from the doorbell. How do I stop the constant buzzing but keep power to the doorbell?

The old chime should have been bypassed during installation. Do you have more than one doorbell? How many wires are on the old chime?

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