Should I handle order number using the model's ID?

I've an personal ecommerce site.

I'm using the ID of the model as the Order Number. Just because it seemed logic, and I was expecting ID would increment just by 1 everytime.

However, I'm noticing that the ID of my Orders (of my Order model) had jumped twice:

a) From 54 to 86 (32 of difference).
b) From 99 to 132 (33 of difference).

Don't know why, don't know if I should use a custom field instead of the models ID.

I'm using Django 3.0 and hosting my project on Heroku.

models.py:

class Order(models.Model):
    ORDER_STATUS = (
        ('recibido_pagado', 'Recibido y pagado'),
        ('recibido_no_pagado', 'Recibido pero no pagado'),
        ('en_proceso', 'En proceso'),
        ('en_camino', 'En camino'),
        ('entregado', 'Entregado'),
        ('cancelado', 'Cancelado por no pagar' )
    )
    token = models.CharField(max_length=100, blank=True, null=True)
    first_name = models.CharField(max_length=50, blank=True, null=True)
    last_name = models.CharField(max_length=50, blank=True, null=True)
    phone_number = models.CharField(max_length=30, blank=True)
    total = models.DecimalField(max_digits=10, decimal_places=2)
    stickers_price = models.DecimalField(max_digits=10, decimal_places=2)
    discount = models.DecimalField(max_digits=10, decimal_places=2, default=Decimal('0.00'))
    shipping_cost = models.DecimalField(max_digits=10, decimal_places=2)
    email = models.EmailField(max_length=250, blank = True, verbose_name= 'Correo electrónico')
    last_four = models.CharField(max_length=100, blank=True, null=True)
    created = models.DateTimeField(auto_now_add=True)
    shipping_address = models.CharField(max_length=100, blank=True, null=True)
    shipping_address1 = models.CharField(max_length=100, blank=True, null=True)
    reference = models.CharField(max_length=100, blank=True, null=True)
    shipping_department = models.CharField(max_length=100, blank=True, null=True)
    shipping_province = models.CharField(max_length=100, blank=True, null=True)
    shipping_district = models.CharField(max_length=100, blank=True, null=True)
    reason = models.CharField(max_length=400, blank=True, null=True, default='')
    status = models.CharField(max_length=20, choices=ORDER_STATUS, default='recibido_pagado')
    comments = models.CharField(max_length=400, blank=True, null=True, default='')
    cupon = models.ForeignKey('marketing.Cupons', blank=True, null=True, default=None, on_delete=models.SET_NULL)


    class Meta:
        db_table = 'Order'
        ordering = ['-created']

    def __str__(self):
        return str(self.id)

    def igv(self):
        igv = int(self.total) * 18/100
        return igv

    def shipping_date(self):
        shipping_date = self.created + datetime.timedelta(days=10)
        return shipping_date

    def deposit_payment_date(self):
        deposit_payment_date = self.created + datetime.timedelta(days=2)
        return 

View that creates the order:

@csrf_exempt
def cart_charge_deposit_payment(request):
    amount = request.POST.get('amount')
    email = request.user.email
    shipping_address = request.POST.get('shipping_address')
    shipping_cost = request.POST.get('shipping_cost')
    discount = request.POST.get('discount')
    stickers_price = request.POST.get('stickers_price')
    comments = request.POST.get('comments')
    last_four = 1111  
    transaction_amount = amount  

    first_name = request.user.first_name

    last_name = request.user.last_name

    phone_number = request.user.profile.phone_number

    current_time = datetime.datetime.now().strftime('%Y-%m-%d %H:%M:%S')

    shipping_address1 = request.user.profile.shipping_address1

    reference = request.user.profile.reference

    shipping_department = request.user.profile.shipping_department

    shipping_province = request.user.profile.shipping_province

    shipping_district = request.user.profile.shipping_district



    order_details = Order.objects.create(
        token='Random',
        first_name=first_name,
        last_name=last_name,
        phone_number=phone_number,
        email=email,  # Using email entered in Culqi module, NOT user.email. Could be diff.
        total=transaction_amount,
        stickers_price = stickers_price,
        discount = discount,
        shipping_cost=shipping_cost,
        last_four=last_four,
        created=current_time,
        shipping_address=shipping_address,
        shipping_address1=shipping_address1,
        reference=reference,
        shipping_department=shipping_department,
        shipping_province=shipping_province,
        shipping_district=shipping_district,
        status='recibido_no_pagado',
        cupon=cupon,
        comments=comments
    )

    ...

from Should I handle order number using the model's ID?