If I use a form field like this:
categories = forms.ModelMultipleChoiceField(queryset=Categories.objects.all(), widget=forms.CheckboxSelectMultiple)
and send the form with one of the boxes selected it is not selected in the resulting response object anymore. When I use {{ form.as_p }} or just {{ form.categories }} instead of {{ form|as_bootstrap }}, the box is still selected as it should be!
I hope you know what I mean! :-)