Eufy Doorbell sends signal to mechanical chime too long

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All of a sudden, when I ring the Eufy wireless doorbell with my mechanical chime, it causes it to ding first, then makes the plunger vibrate back and forth for about two seconds (making a loud vibrating sound), then finally doing the song after doing just one short press with the doorbell. How can I tell it to send just one short signal, instead of this long one? It didn’t used to when I first installed it the other day.