Symfony2 empty BBDD on edit form - php

Question

I have this forms + controllers http://pastebin.com/wLPyXvbj
They are working when I'm adding data to DB (new data) but I have troubles while editing, I explain here the best I can.
Case 1
I edit EVERY SINGLE FIELD, data is updated on DB OK.
Case 2
I try to edit FEW fields, only fields I want users to edit instead of editing everything. Fields that have been available for update are inserted into DB without problem, but the other fields, thoose which I didn't want users to modify instead of keeping the old values in DB (because they HAVEN'T changed), they all turn empty values.
So there is something wrong with "selective editing" instead of "all fields edit" but I can't find the problem... I can't make an all fields edit form because some of them are static, no edits.
This is the controller I'm using for the edit action, as you can see it is diferent from the newAction
public function agentupdateAction(Request $request, $id)
{
$em = $this->getDoctrine()->getManager();
$comments = new VtigerTicketcomments();
$session = $this->get("session");
$proyecto = $session->get('proyecto');
$assets = $session->get('assets');
$contacts = $em->createQuery('SELECT u.contactid, u.email, u.phone, u.mobile FROM WbsGoclientsBundle:VtigerContactdetails u')->getResult(\Doctrine\ORM\Query::HYDRATE_ARRAY);
foreach($assets as $a)
$uuids[$a['UUID']] = $a['UUID'];
$entity = $em->getRepository('WbsGoclientsBundle:VtigerTicketcf')->find($id);
$ticket = $entity->getId();
$solution = $ticket->getSolution();
$ticketcfForm = $this->createForm(new TicketcfType($uuids, $session->get('contacts'), $session->get('rol'), $session->get('tecnicos')), $entity);
$ticketcfForm->submit($request);
if($ticketcfForm->isValid())
{
$data = $ticketcfForm->getData();
if($ticket->getStatus() == 'Closed')
{
if(!$ticket->getSolution())
$ticket->setSolution($solution);
$workflow = new ComVtigerWorkflowtaskQueue();
$workflow->setTaskid('9');
$workflow->setEntityid('9x'.$id);
$workflow->setDoafter('0');
$em->persist($workflow);
$em->flush();
$hoy = new \DateTime();
if($ticketcf->getFReso() == null)
$ticketcf->setFReso($hoy->format('d-m-Y H:i:s'));
}
$em->persist($ticket);
$em->flush();
$em->persist($entity);
$em->flush();
return $this->redirect($this->generateUrl('tickets_show', array('id' => $ticket->getTicketNo())));
}
return $this->render('WbsGoclientsBundle:Tickets:edit.html.twig', array(
'entity' => $entity,
'edit_form' => $editForm->createView(),
'rol' => $session->get('rol'),
'ticket_form' => $ticketForm->createView(),
));
}