Non-separation of elements

With this code, after pressing the close button, not only that product but all products will be sold, and the buyer cannot offer a price for any of them.

views.py:

@login_required
def page_product(request, productid):
    product =get_object_or_404(Product, pk=productid)
    offers = Bid_info.objects.filter(product=product).order_by("-bid_price")
    off = Bid_info.objects.filter(product=product).order_by('id').first()


    # max bid   
    try:
        bid_max = Bid_info.objects.filter(product_id=productid).latest('bid_price')
    except:
        bid_max ="No offer has been registered yet!"
    
    # close
    close_button = False
    try:
        if request.user == product.user:
                close_button = True
                off.bid_price = bid_max
                win = 
        Bid_info.objects.filter(product_id=productid).order_by('id').latest("seller")
            
                for item in Bid_info.product:
                    if item.id == Bid_info.product.id:
                        Bid_info.checkclose = not Bid_info.checkclose
        else:
            close_button = False
    except:
        pass
    

context = {
    'product' : product,,
    'offers' : offers,
    'off' : off,
    'close_button' : close_button, 
    'bid_max' : bid_max,
    'checkclose' : Bid_info.checkclose,
    'winner' : win   
}
return render(request, 'auctions/page_product.html', context)


def close(request, cid):
    return redirect(page_product, cid


# bid
def bid(request, bidid):
    product = get_object_or_404(Product, pk=bidid)
    if request.method == 'POST':
        user = request.user
        if user.is_authenticated:
            bid_price = Decimal(request.POST.get("bid_price", False))
            other_off = Bid_info.objects.filter(product=product).order_by("-bid_price").first()
       
            if Bid_info.checkclose :
                messages.warning(request, "it sells.")
        
            else:
                Bid_ = Bid_info(product=product, seller=request.user, bid_price=bid_price)
            
    return redirect('page_product', bidid)

If I delete the for loop in the first function and write this in the bid function in the if loop:
if Bid_info.checkclose== true
This is the situation again.

html:

<form method="post"  action="{% url 'close' product.id %}">
    {% csrf_token %}
    {% if close_button %}
        <button type="submit" class="btn btn-primary">Close</button> 
    {% else %}
        <p> {{product.user}} is seller!</p>
    {% endif %}
</form>

models.py:

class Bid_info(models.Model):
    product = models.ForeignKey(Product, on_delete=models.CASCADE)
    seller = models.ForeignKey(User, on_delete=models.CASCADE, related_name="seller")
    bid_price = models.DecimalField(max_digits=10, decimal_places=2)
    checkclose = models.BooleanField(default=False)
    winner = models.ForeignKey(User, on_delete=models.SET_NULL, null=True, 
                                                               blank=True)