Unexpected Digital Input Triggering SOLVED

[Paul_KD7HB]

@salmec

Then, strange things started happening—the digital input would trigger randomly. I even disconnected the wire from the button, and the input would still activate on its own unpredictably.

But you still had the pull-up resistor connected. The voltage drop on the resistor when the extra current draw suddenly reduced the voltage on the resistor which is identical to what happened when you pressed the button.