X prints twice on dungeon map. Why!?

import random
import os



CELLS = [ (0,0), (1,0), (2,0), (3,0), (4,0),
          (0,1), (1,1), (2,1), (3,1), (4,1),
          (0,2), (1,2), (2,2), (3,2), (4,2),
          (0,3), (1,3), (2,3), (3,3), (4,3),
          (0,4), (1,4), (2,4), (3,4), (4,4)]

def clear_screen():
  os.system('cls' if os.name == 'nt' else 'clear')


def get_locations():
  return random.sample(CELLS, 3)

def move_player(player, move):
  x,y = player
  if move == "LEFT":
    x = x - 1
  elif move == "RIGHT":
    x = x + 1
  elif move == "UP":
    y = y - 1
  elif move == "DOWN":
    y = y + 1
  else :
    print("That's not a direction!")
  player = x,y  
  return player

def get_moves(player):
  moves = ["LEFT", "RIGHT", "UP", "DOWN"]
  if player[1] == 0 :
    moves.remove("UP")
  if player[1] == 4:
    moves.remove("DOWN")
  if player[0] == 0:
    moves.remove("LEFT")
  if player[0] == 4:
    moves.remove("RIGHT")
  return moves

def draw_map(player):
    print(" _"*5)
    tile = "|{}"

    for cell in CELLS:
        x, y = cell
        if x < 4:
            line_end = ""
            if cell == player:
                output = tile.format("X")
            else:
                output = tile.format("_")
        else:
            line_end = "\n"
            if cell == player:
                output = tile.format("X|")
            else:
                ouput = tile.format("_|")
        print(output, end=line_end)


def game_loop():
  monster, door, player = get_locations()
  playing = True

  while playing:
    clear_screen() 
    draw_map(player)
    valid_moves = get_moves(player)
    print("You're currently in room {}".format(player))
    print("You can move {}".format(", ".join(valid_moves)))
    print("Enter QUIT to quit")

    move = input("> ")
    move = move.upper()

    if move == 'QUIT' :
      print("\n See you next time! \n")
      break
    if move in valid_moves:
      player = move_player(player, move)

      if player == monster :
        print("\n You ran into the Monster. You're dead! \n")
        playing = False

      if player == door :
        print("\n You found the door, You win! \n")
        playing = False

    else: 
      input("\n ** You ran into a wall, ouch! **\n")
  else:
    if input("Play again? [Y/n]").lower() != "n":
      game_loop()


clear_screen()
print("Welcome to the dungeon!")
input("Press Enter Button to start!")
clear_screen()
game_loop()