Django. I can't understand the error of removing products from the catalog

I'm making a catalog, I can't understand why products are not displayed by catalog categories, it gives an error 404. The sections in the catalog work as they should. Here is the code: I am grateful in advance for any hint! models.py

`

from django.db import models
from django.urls import reverse


class Catalog_text(models.Model):
    text_left = models.TextField('Text1')
    text_right = models.TextField('Text2')
    signature = models.CharField(max_length=255, verbose_name="Signature")

    class Meta:
        verbose_name = 'Text1'
        verbose_name_plural = 'Text2'

class Catalog(models.Model):

    sections = models.CharField(max_length=150, db_index=True, verbose_name="Name")
    img = models.ImageField(upload_to='img/catalog/')
    slug = models.SlugField(max_length=150, db_index=True, unique=True, null=True)

    class Meta:
        ordering = ('sections',)
        index_together = (('id', 'slug'),)
        verbose_name = 'catalog'
        verbose_name_plural = 'catalogs'

    def __str__(self):
        return self.sections

    def get_absolute_url(self):
            return reverse('catalog', kwargs={"slug": self.slug})



class Category(models.Model):
    catalog = models.ForeignKey(Catalog, related_name='catalog', on_delete=models.CASCADE,
                                 verbose_name='Select a directory'
                                 )
    name = models.CharField(max_length=150, db_index=True, verbose_name="Name") 
    img = models.ImageField(upload_to='img/catalog/')
    slug = models.SlugField(max_length=200, db_index=True, unique=True, null=True)

    class Meta:
        ordering = ('name',)
        index_together = (('id', 'slug'),)
        verbose_name = 'Category'
        verbose_name_plural = 'Categories'
    
    def __str__(self):
        return self.name

    def get_absolute_url(self):
            return reverse('catalog-detail', kwargs={"slug": self.slug})


class Product(models.Model):
    category = models.ForeignKey(Category, related_name='category', on_delete=models.CASCADE,
                                verbose_name='Select a category'
                                )
    name = models.CharField(max_length=255, db_index=True,unique=True, null=True, verbose_name="Название")
    text = models.TextField('Текст')
    url = models.CharField(max_length=255, db_index=True, verbose_name="Link to the website")
    pdf = models.FileField(upload_to='pdf/')
    slug = models.SlugField(max_length=200, db_index=True, unique=True, null=True)
    
    class Meta:
        ordering = ('name',)
        index_together = (('id', 'slug'),)
        verbose_name = 'Product'
        verbose_name_plural = 'Products'
    
    def __str__(self):
        return self.name

    def get_absolute_url(self):
        return reverse('product-detail', kwargs={"slug": self.slug})


class Gallery(models.Model):
    image = models.ImageField(upload_to='img/catalog/')
    product = models.ForeignKey(Product, on_delete=models.CASCADE, related_name='images')
    class Meta:
        verbose_name = 'Gallery'
        verbose_name_plural = 'Galleries'

urls.py

from django.contrib import admin
from django.urls import path, include

from . import views

urlpatterns = [
    path('', views.CatalogView.as_view(), name='catalog'),
    path('<slug>/', views.CatalogDetailViews.as_view(), name='catalog-detail'),
    path('product/<slug>', views.ProductDetailViews.as_view(), name='product-detail')
]

` views.py

`

from django.shortcuts import render, get_object_or_404
from .models import Catalog_text, Catalog, Category, Product
from django.views.generic import DetailView, ListView

class CatalogView(ListView):
    model = Catalog
    template_name = 'catalog/catalog.html'
    context_object_name = 'catalog'

class CatalogDetailViews(ListView):
    model = Category
    template_name = 'catalog/catalog-detail.html'
    context_object_name = 'category'

    def get_context_data(self, **kwargs):
        context = super(CatalogDetailViews, self).get_context_data(**kwargs)
        context['cat'] = Catalog.objects.all()
        return context

    def get_queryset(self):   
        category = get_object_or_404(Catalog, slug__iexact=self.kwargs.get('slug'))
        queryset = category.catalog.all()
        return queryset


class ProductDetailViews(DetailView):
    model = Product
    template_name = 'catalog/product-detail.html'
    context_object_name = 'product'

` In the template:

{% for cat in category %}
                    <div class="room-item catalog_items">
                        <ul class="hover-effect-cover">
                            <li>
                              <img src="{{ cat.img.url }}" alt="">
                              
                              <div class="effect-to-top">
                                <h3>{{ cat.name }}</h3>
                                <p></p>
                                <a href="{% url 'product-detail' cat.id %}" class="button">more detailed</a>
                              </div>
                            </li>
                        </ul>
                    </div>
                    {% endfor %}

Let's say I'm in the admin panel category test and product for this category product1, the link in the template turns out to be catalog/product/test and, accordingly, gives 404, but if I correct the link in the address bar to catalog/product/product1, then everything will open as it should (product description).

{% url 'product-detail' cat.id %}

{% url 'catalog-detail' cat.slug %}

{% for cat in category %}
    {% for prod in cat.product_set.all %}

{% url 'product-detail' prod.slug %}