Symfony2 personalise form with twig

Is it possible to display in another order than how I coded it in my builder?

For example:

$builder
            ->add('persno', 'text', array('required' => false, 'label' => 'Personel Number '))
            ->add('firstname', 'text', array('required' => false, 'label' => 'First name '))
            ->add('lastname', 'text', array('required' => false, 'label' => 'Last name '))

And my twig file:

{{ form_row(form.firstname) }}
{{ form_row(form.lastname) }}
{{ form_row(form.persno) }}

Actually my form is not not working, when I click on my submit button it does change of URL but does not send my form in a POST request. It does not even say that there were errors.

Thanks for your help!

EDIT:

I am not going to send all the code but here is how it looks like:

    {{ form_start(form, {'attr': {'class': 'form-horizontal'}}) }}
            {{ form_errors(form) }}

            <div class="form-group">

              {{ form_label(form.persno, "Personel Number", {'label_attr': {'class': 'col-sm-2 control-label'}}) }}
              {{ form_errors(form.persno) }}
              <div class="col-sm-2">
                {{ form_widget(form.persno, {value: idm.persno, 'attr': {'class': 'form-control'}}) }}
              </div>


              {{ form_label(form.serverroomalerts, "Server Room Alerts", {'label_attr': {'class': 'col-sm-2 control-label'}}) }}
              {{ form_errors(form.serverroomalerts) }}
              <div class="col-sm-2">
                {{ form_widget(form.serverroomalerts, {'attr': {'class': 'form-control'}}) }}
              </div>

              {{ form_label(form.cpc, "CPC", {'label_attr': {'class': 'col-sm-2 control-label'}}) }}
              {{ form_errors(form.cpc) }}
              <div class="col-sm-2">
                {{ form_widget(form.cpc, {'attr': {'class': 'form-control'}}) }}
              </div>

            </div>
        <div id="buttons" class="form-group">
            <div class="col-sm-6 control-label">
                {{ form_widget(form.submit, {'label': 'Save changes', 'attr': {'class': 'btn btn-lg btn-primary'}}) }}
            </div>
        </div>
        {{ form_rest(form) }}
        {{ form_end(form) }}

Personel Number, Server Room Alerts and CPC are not in the same order in my EntityType.php. I create my form like that :

$form = $this->get('form.factory')->createForm(new SciencePersonelAdhocType(), $science, array(
                'action' => $this->generateUrl('admin_platform_edit'),
                'method' => 'POST')))
                ->add('submit', 'submit');