[Python] Django messages being displayed twice

I'm using Django's message framework, and I have a very odd problem where my messages are being displayed twice in the template, even though {{messages|length}} is 1

My view

if request.method == 'POST':
form = EditProfileForm(user=request.user, meta=meta, data=request.POST, files=request.FILES)
if form.is_valid():
user = form.save()
if 'uploaded_image' in request.FILES:
#TODO limit image size, check mime type
filename = request.FILES['uploaded_image']
destination = open('%s/%s' % (settings.FILE_UPLOAD_PATH, form.filename), 'wb+')
for chunk in filename.chunks():
destination.write(chunk)
destination.close()

print 'adding success message' #this is printed once
messages.success(request, 'Settings saved.') #this message is displayed twice
#messages.add_message(request, messages.SUCCESS, 'Yup. Saved.')

return HttpResponseRedirect(reverse('someview'))
else:
print form.errors
messages.error(request, 'Error updating settings. See errors below.')


in my template:

{% block message%}
{{message.count}}
{% if messages %}
{{messages|length}}
{% for message in messages%}
<p class="{{message.tags}}">{{message}}</p>
{% endfor %}
{% endif %}
{% endblock %}


Any ideas?

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