'A' and 'B' buttons not working on Pi Zero W

[JohnAo]

Basic infomation

Pi Model: Raspberry Pi Zero W
Power Supply used: 5V USB
RetroPie Version Used :retropie-4.4-rpi1_zero.img
Built From: official SD card img file(see above)
USB Devices connected: 32GB SanDisk
Controller used: wareshare 1.44inch LCD display HAT for Raspberry Pi
Guide used: this page

The problem

In the guide, it provides a /boot/retrogame.cfg file example:

# Sample configuration file for retrogame.
# Really minimal syntax, typically two elements per line w/space delimiter:
# 1) a key name (from keyTable.h; shortened from /usr/include/linux/input.h).
# 2) a GPIO pin number; when grounded, will simulate corresponding keypress.
# Uses Broadcom pin numbers for GPIO.
# If first element is GND, the corresponding pin (or pins, multiple can be
# given) is a LOW-level output; an extra ground pin for connecting buttons.
# A '#' character indicates a comment to end-of-line.
# File can be edited "live," no need to restart retrogame!

# Here's a pin configuration for the PiGRRL 2 project:

LEFT       6  # Joypad left
RIGHT     19  # Joypad right
UP         5  # Joypad up
DOWN       0  # Joypad down
LEFTCTRL  14  # 'A' button
LEFTALT   23  # 'B' button
Z         27  # 'X' button
X         22  # 'Y' button
SPACE     15  # 'Select' button
ENTER     26  # 'Start' button
#A        12  # Left shoulder button
#S        13  # Right shoulder button
#ESC      17  # Exit ROM; PiTFT Button 1
#1        22  # PiTFT Button 2
#2        23  # PiTFT Button 3
#3        27  # PiTFT Button 4

# For configurations with few buttons (e.g. Cupcade), a key can be followed
# by multiple pin numbers.  When those pins are all held for a few seconds,
# this will generate the corresponding keypress (e.g. ESC to exit ROM).
# Only ONE such combo is supported within the file though; later entries
# will override earlier.

With interface definition from the wareshare site, I modified the file as such:

LEFT       5  # Joypad left
RIGHT     26  # Joypad right
UP         6  # Joypad up
DOWN      19  # Joypad down
LEFTCTRL  21  # 'A' button
LEFTALT   20  # 'B' button
#Z         21  # 'X' button
#X         20  # 'Y' button
SPACE     13  # 'Select' button
ENTER     16  # 'Start' button
#A        12  # Left shoulder button
#S        13  # Right shoulder button
#ESC      17  # Exit ROM; PiTFT Button 1
#1        22  # PiTFT Button 2
#2        23  # PiTFT Button 3
#3        27  # PiTFT Button 4

All the buttons are fine excpet LEFTCTRL and LEFTALT.

I tried to use different pins for these two buttons to check if it's because my controllers on the LCD HAT are broken, but the problem remains.

Now I cannot even entera game from the main page for I can't press button 'A'.

Any suggestion would be appreciated.