Weird behavior with button box

Using Arduino Programming Questions
1

Hello, I was doing a button box and I modified a source code I found a little to fit what I was doing. However, I run into an issue, and don't know how to fix it.

void setup() {
  pinMode(12, INPUT_PULLUP);
  pinMode(13, INPUT_PULLUP);
}

const int pinToButtonMap = 12;

int lastButtonState[3] = {0,0,0};

void loop() {

 for (int index = 0; index < 3; index++)
  {
    int currentButtonState = !digitalRead(index + pinToButtonMap);
    if (digitalRead(12) == HIGH && digitalRead(13) == LOW)
    {
      Joystick.setButton(index, currentButtonState);
      lastButtonState[index] = currentButtonState;
    }
    else if (digitalRead(12) == LOW && digitalRead(13) == HIGH)
    {
      Joystick.setButton(index, currentButtonState);
      lastButtonState[index] = currentButtonState;
    }
    else
    {
      Joystick.setButton(index, currentButtonState);
      lastButtonState[index] = currentButtonState;
    }
  }
}

When running this, the behavior I'd expect is 1 being on if 12 is off but 13 is toggled, 2 being on if vice versa, and 3 being on if none of them are toggled. What I get is 3 is always on, 1 and 2 are on when their conditions are met.

Something else that happens is if I remove the else statement and modify the code to do 2 buttons, 1 and 2 work but they stay on after their conditions are dropped. Fixing either behavior would make this work for me, I don't strictly need a 3rd button to work if 1 and 2 are turning off correctly however a 3rd button would be nice. Any ideas?

2

When index is 2, this code will read pin 14, which you have not set to mode INPUT_PULLUP.

3

Completely overlooked that, setting the index to < 2 worked, thank you