Why does the click disappear when going to the page?

Question

Python

Using Python, django
I have a button on my page that counts the number of clicks on it. When I refresh the page, this number is saved, but if I go to another page, the value is reset to zero.
views.py:

def black(request):
    value = Choose()

    if request.method == 'POST':
        select_action = request.POST['choose']

        if select_action == 'black':
            value.count_black += 1

        value.save()
        # return redirect("home")

    context = {"value": value}

    return render(request, 'registration/black.html', context)

models.py:
from django.db import models


class Choose(models.Model):
    count_black = models.PositiveIntegerField(default=0)
    count_white = models.PositiveIntegerField(default=0)
    count_purple = models.PositiveIntegerField(default=0)

form(black.html):

<form method="post">
    {% csrf_token %}

        <button  class="button_b" name="choose" value="black">
            <h1 style="color: white">
                <strong>Choose</strong>
            </h1>
        </button>

        <h1 style="color: red">{{ value.count_black }}</h1> {# строка, выводящая значение #}
    </form>

And yet, when you click on the button, the value changes + by one once, and then remains the same. Why? Help me please.