Arduino Keypad Library on NodeMCU buttons mapped the wrong way - arduino

Question

I am attaching a 4x4 membrane keypad to my NodeMCU (ESP8266-12E).
I am using the standard Keypad library for Arduino.
The layout of the keypad look like this:
1 2 3 A
4 5 6 B
7 8 9 C
* 0 # D
Everything works fine except the buttons A and B, which will behave like the buttons 1 and 4, so Pressing A gives me 1, and pressing B gives me 4.
I tried testing the same code on a Arduino Nano, the problem doesn't occur here.
I also tested the Keypad itself to see if it was wired correctly. The keypad is wired correctly.
What is causing the keypad to not work on the buttons A and B?
The code:
#include <Keypad.h>
const byte ROWS = 4; //four rows
const byte COLS = 4; //four columns
char keys[ROWS][COLS] = {
{'1','2','3', 'A'},
{'4','5','6', 'B'},
{'7','8','9', 'C'},
{'*','0','#', 'D'}
};
byte rowPins[ROWS] = {5,4,0,2};
byte colPins[COLS] = {14,12,13,15};
Keypad keypad = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );
byte ledPin = 13;
boolean blink = false;
boolean ledPin_state;
void setup(){
Serial.begin(9600);
pinMode(ledPin, OUTPUT); // Sets the digital pin as output.
digitalWrite(ledPin, HIGH); // Turn the LED on.
ledPin_state = digitalRead(ledPin); // Store initial LED state. HIGH when LED is on.
keypad.addEventListener(keypadEvent); // Add an event listener for this keypad
}
void loop(){
char key = keypad.getKey();
if (key) {
Serial.println(key);
}
if (blink){
digitalWrite(ledPin,!digitalRead(ledPin)); // Change the ledPin from Hi2Lo or Lo2Hi.
delay(100);
}
}
// Taking care of some special events.
void keypadEvent(KeypadEvent key){
switch (keypad.getState()){
case PRESSED:
if (key == '#') {
digitalWrite(ledPin,!digitalRead(ledPin));
ledPin_state = digitalRead(ledPin); // Remember LED state, lit or unlit.
}
break;
case RELEASED:
if (key == '*') {
digitalWrite(ledPin,ledPin_state); // Restore LED state from before it started blinking.
blink = false;
}
break;
case HOLD:
if (key == '*') {
blink = true; // Blink the LED when holding the * key.
}
break;
}
}

Answer 1

The problem here appears to be the use of pin D8.
If you shift all of your connectors to D0 - D7 you will find that this works as expected