Pygame：一部のスプライトが画面の右側で動かなくなっています

私のゲームはほぼ完了です！残念ながら、修正が必要な詳細がいくつかあります。主なものは、少し遊んだ後、いくつかのスプライトが画面の前面に詰まるということです。誰か助けてくれませんか。

import pygame, random
from pygame.locals import (
    K_UP,
    K_DOWN,
    K_LEFT,
    K_RIGHT,
    KEYDOWN,
    QUIT,
)
print('Use the window above to play')
pygame.init()
pygame.font.init()
clock = pygame.time.Clock()

score = 0
display_width = 800
display_height = 600
X = 400
Y = 400
SCREEN_WIDTH = display_width
SCREEN_HEIGHT = display_height
screen = pygame.display.set_mode((display_width,display_height))

def death():
    global alive
    print('You died')
    myfont = pygame.font.SysFont('Comic Sans MS', 100)
    textsurface = myfont.render('You Died.', False, (0, 0, 0))
    screen.blit(textsurface,(0,0))
    

class Player(pygame.sprite.Sprite):
    def __init__(self, x, y):
        super(Player, self).__init__()
        self.surf = pygame.image.load("Plane.png").convert()
        self.rect = self.surf.get_rect(topleft = (x, y))

    def update(self, pressed_keys):
        if pressed_keys[K_UP]:
            self.rect.move_ip(0, -5)
        if pressed_keys[K_DOWN]:
            self.rect.move_ip(0, 5)
        if pressed_keys[K_LEFT]:
            self.rect.move_ip(-5, 0)
        if pressed_keys[K_RIGHT]:
            self.rect.move_ip(5, 0)

        if self.rect.left < 0:
            self.rect.left = 0
        if self.rect.right > SCREEN_WIDTH:
            self.rect.right = SCREEN_WIDTH
        if self.rect.top <= 0:
            self.rect.top = 0
        if self.rect.bottom >= SCREEN_HEIGHT:
            self.rect.bottom = SCREEN_HEIGHT

class Enemy(pygame.sprite.Sprite):
    def __init__(self):
        super(Enemy, self).__init__()
        self.surf = pygame.Surface((20, 10))
        self.surf = pygame.image.load("Missile.png").convert()
        self.rect = self.surf.get_rect(
            center=(
                random.randint(SCREEN_WIDTH + 20, SCREEN_WIDTH + 100),
                random.randint(0, SCREEN_HEIGHT),
            )
        )
        self.speed = random.randint(5, 10)

    def update(self):
        self.rect.move_ip(-self.speed, 0)
        if self.rect.right < 0:
            global score
            score += 1
            self.kill()

class Bomb(pygame.sprite.Sprite):
    def __init__(self):
        super(Bomb, self).__init__()
        self.surf = pygame.Surface((50, 25))
        self.surf = pygame.image.load("Bomber.png").convert()
        self.rect = self.surf.get_rect(
            center=(
                random.randint(SCREEN_WIDTH + 20, SCREEN_WIDTH + 100),
                random.randint(0, SCREEN_HEIGHT),
            )
        )
        self.speed = random.randint(2, 5)

    def update(self):
        self.rect.move_ip(-self.speed, 0)
        if self.rect.right < 0:
            global score
            score += 2
            self.kill()

class Blimp(pygame.sprite.Sprite):
    def __init__(self):
        super(Blimp, self).__init__()
        self.surf = pygame.Surface((75, 35))
        self.surf = pygame.image.load("Blimp.png").convert()
        self.rect = self.surf.get_rect(
            center=(
                random.randint(SCREEN_WIDTH + 20, SCREEN_WIDTH + 100),
                random.randint(0, SCREEN_HEIGHT),
            )
        )
        self.speed = random.randint(1, 3)

    def update(self):
        self.rect.move_ip(-self.speed, 0)
        if self.rect.right < 0:
            global score
            score += 3
            self.kill()

ADDENEMY = pygame.USEREVENT + 1
pygame.time.set_timer(ADDENEMY, 950)

player = Player(display_width // 2, display_height // 2)

enemies = pygame.sprite.Group()
bomb = pygame.sprite.Group()
blimp = pygame.sprite.Group()
all_sprites = pygame.sprite.Group()
all_sprites.add(player)

alive = True
while alive:
    for event in pygame.event.get():
        print(event)
        if event.type == pygame.QUIT:
            alive = False

        elif event.type == ADDENEMY:
            new_enemy = Enemy()
            new_bomb = Bomb()
            new_blimp = Blimp()
            spawn = random.randint(1,3)
            if spawn == 1:
                enemies.add(new_enemy)
            if spawn == 2:
                enemies.add(new_blimp)
            if spawn == 3:
                enemies.add(new_bomb)
            all_sprites.add(new_enemy)
            all_sprites.add(new_bomb)
            all_sprites.add(new_blimp)

    pressed_keys = pygame.key.get_pressed()
    player.update(pressed_keys)

    enemies.update()

    screen.fill((50,50,160))

    for entity in all_sprites:
        screen.blit(entity.surf, entity.rect)

    if pygame.sprite.spritecollideany(player, enemies):
        player.kill()
        alive = False
        death()

    screen.blit(player.surf, player.rect)

    pygame.display.flip()

    pygame.display.update()
    clock.tick(60)

矢印キーを押して移動します。（新しいウィンドウにはない）テキストボックスにスコアが表示されます。