title: FormSet saves the data of only one form
body: <p>When I submitted forms (but on page I filled id more than 1 form) - my FormSet saves the data of only one form, the rest of the data just disappear...</p>
  
  <p>My template:</p>
  
  <pre><code> &lt;div id="data"&gt;
      &lt;form method="post" action="/lookup/" id="test_data"&gt;{% csrf_token %}
      {{ formset.management_form }}
          {% for form in formset %}
              &lt;section id="test_data_row"&gt;
              {{ form }}
              &lt;/section&gt;
          {% endfor %}
      &lt;/form&gt;
  &lt;/div&gt;
  &lt;div class="bt"&gt;
      &lt;button type="submit" class="btn btn-default" id="submit_form" form="test_data"&gt;Submit&lt;/button&gt;
      &lt;button type="button" class="btn btn-default" id="add" value="Add row"/&gt;Add row&lt;/button&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>My forms.py:</p>
  
  <pre><code>class LookupForm(forms.ModelForm):
     class Meta:
        model = look
        exclude = ()
  LookupFormSet = formset_factory(LookupForm, can_delete=True)
  </code></pre>
  
  <p>My model</p>
  
  <pre><code>class look(models.Model):
      class Meta():
          db_table = 'lookup'
      id_device = models.CharField(max_length=75)
      phone_number = models.CharField(max_length=100)
      phone_number_country = models.CharField(max_length=1000)
      text = models.CharField(max_length=1000, default=None)
  </code></pre>
  
  <p>my views.py:</p>
  
  <pre><code>def manage_articles(request):
     LookupFormSet = modelformset_factory(model=look, exclude=())
     if request.method == "POST":
        formset = LookupFormSet(
           request.POST, request.FILES,
           queryset=look.objects.none(),
        )
        if formset.is_valid():
           for form in formset:
               form.save()
        return HttpResponseRedirect('/')
     else:
        formset = LookupFormSet(queryset=look.objects.none())
     return render(request, 'req/lookup.html', {'formset': formset})
  </code></pre>
  
  <p>my JS (js for add new form):</p>
  
  <pre><code>document.getElementById('add').onclick = duplicate;
  var i = 0;
  var original = document.getElementById('test_data');
  function duplicate() {
     var clone = original.cloneNode(true); // "deep" clone
     clone.id = "test_data" + ++i; // there can only be one element with an ID
     original.parentNode.appendChild(clone);
  }
  </code></pre>