GPIO / System.Device.Gpio / RegisterCallbackForPinValueChangedEvent / Rising and Falling Continuously with circuit closed

Question

I have circuit associated with a value. When the circuit is closed, I know the valve is open, when the circuit is open, the value is closed.

I used this circuit to monitor pin 21

   gpioController.RegisterCallbackForPinValueChangedEvent(
       applicationConfiguration.ValveMonitoredOnGpioPin,
       PinEventTypes.Falling | PinEventTypes.Rising,
       OnPinEvent);

When the circuit closes, I would like a Rising event, and when the circuit opens, I would like a Falling.

The log is showing me this for each invocation of onPinEvent:

Is this normal behaviour? I have a power step down, which drops the voltage from 9V battery, to 3.3V. How would I determine if this is the root cause, and the multi-meter shows a steady 3.3 (or the drop cadence of rise and fall is too fast)?

I could throttle the events, but I need to know when the value opens, and when it closes, and throttling could only give me the last event over a period of time.

I'm using the Iot.Device.Bindings V3.1.0. My hardware is a Raspberry PI, running x64 Linux

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