Django - Pagination test

When moving a test from a separate class to a class with other tests, it starts showing 4 posts on the second page instead of 3. If range is changed to 12 it shows 2 posts. Please suggest what is the problem.

def test_correct_page_context_guest_client(self):


    posts = [Post(text=f'Тестовый текст {i}',
                  group=self.group0,
                  author=self.user0) for i in range(
        13)]
    Post.objects.bulk_create(posts)
    pages = (reverse('posts:posts_list'),
             reverse('posts:group_list',
                     kwargs={'slug': f'{self.group0.slug}'}),
             reverse('posts:profile',
                     kwargs={'username': f'{self.user0.username}'}))
    for page in pages:
        for page_number in range(2):
            with self.subTest(page=page):
                response = self.guest_client0.get(
                    page, {'page': page_number+1})
                self.assertEqual(len(response.context['page_obj']),
                                 POSTS_COUNT[page_number])

If the test is left in a separate class PaginatorViewsTest(TestCase): then everything works as it should, but this is the task of the reviewer

I added Post created in SetUpClass to SetUp and deleted it before pagination test with self.post.delete() command

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