Can't understand why code is producing this grid.

import random

CELLS = [(0, 2), (1, 2), (2, 2),
         (0, 1), (1, 1), (2, 1),
         (0, 0), (1, 0), (2, 0)]

def get_locations():
    monster = random.choice(CELLS)
    door = random.choice(CELLS)
    player = random.choice(CELLS)
    start = player

    if monster == door or monster == player or player == door:
        return get_locations()
    return monster, door, player

def move_player(player, move):
    x, y = player

    if move == 'LEFT':
        x -= 1
    elif move == 'RIGHT':
        x += 1
    elif move == 'UP':
        y += 1
    elif move == 'DOWN':
        y -= 1

    return x, y

def get_moves(player):
    moves = ['LEFT', 'RIGHT', 'UP', 'DOWN']

    if player[0] == 0:
        moves.remove('LEFT')
    if player[0] == 2:
        moves.remove('RIGHT')
    if player[1] == 0:
        moves.remove('DOWN')
    if player[1] == 2:
        moves.remove('UP')

    return moves

def draw_map(player):
    print(" _ _ _")
    tile = '|{}'

    for idx, cell in enumerate(CELLS):
        if idx in [0, 1, 3, 4, 6, 7]:
            if cell == player:
                print(tile.format('x'), end='')
            else:
                print(tile.format('_'), end='')
        else:
            if cell == player:
                print(tile.format('x|'))
            else:
                print(tile.format('_|'))


monster, door, player = get_locations()

start = player
print('Welcome to The Dungeon.')
print("Enter QUIT to quit.")


while True:
    moves = get_moves(player)
    print("You're currenty in room  {}.".format(player)) 
    print('You can move {}.'.format(moves))

    draw_map(player)

    move = input("> ")

    if move == "QUIT":
        break

    if move == "MONSTER":
        print("The Grue is in {}.".format(monster)) 
        continue

    if move == "DOOR":
        print("The door is in {}.".format(door))
        continue

    if move in moves:
        start = player
        player = move_player(player, move)
    else:
        print("** Walls are hard. Stop walking into them! **")
        player = start      



    if player == door:
        print("You escaped!")
        break
    elif player == monster:
        print("You were eaten by the Grue.")
        break

 _ _ _
|_|_|x|
|_|_|_|
|_|_|_|

def draw_map(player):
    print(" _ _ _")
    tile = '|{}'

    for idx, cell in enumerate(CELLS):
        if idx in [0, 1, 3, 4, 6, 7]:
            if cell == player:
                print(tile.format('x'), end='')
            else:
                print(tile.format('_'), end='')
        else:
            if cell == player:
                print(tile.format('x|'))
            else:
                print(tile.format('_|'))

 _ _ _
|_|_ x|
|_|_ _|
|_|_ _|