How to correctly display the elements of an existing form using bootstrap 3?

Question

Django

There is a generic.UpdateView
with two model
fields fields = ['data', 'numvh']
There is also html that handles this case
Block fragment

{% block content %}

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

<div class="form-group">
  <label>Дата:</label>
    <input type="text" class="form-control" {{ form.data }}
</div>
<div class="form-group">
  <label>Номер входящего:</label>
  <input type="text" class="form-control" {{ form.numvh }}
</div>

input type="submit" class="btn btn-default" value="Внести сведения" />
</form>

{% endblock %}

For half a day of tinkering with the Internet, only the above code allowed us to display the form in the required form

. At the same time, as you can see, the inputs in which the form value is inserted are not closed '>' , and are displayed correctly in chrome. I understand that this is the wrong approach.
Tell me how to correctly display the existing (filled) elements when editing the form (generic.UpdateView)?