Symfony 3 rendering Form wrong Request - forms

Question

In symfony3 i have base view and inside this one im rendering other controller (this controller render form (return view with form - form is method POST)) when i try to use this one on the page object Request-isMethod() always return GET how to fix it.
Part of base view: (main controller show welcome page and render inside this one)
<li><a>{{ render(controller('CommonUserBundle:Login:login')) }}</a></li>
Form login type
class LoginType extends AbstractType
{
public function getName()
{
return 'login_form';
}
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder->
add('username', TextType::class, array(
'label' => 'Użytkownik'
))
->add('password', PasswordType::class, array(
'label' => 'Hasło'
))
->add('remember_me', CheckboxType::class, array(
'label' => 'Zapamiętaj mnie'
))
->add('save', SubmitType::class, array(
'label' => 'Zaloguj'
));
}
}
Controller that render the form above
/**
* #Route("/", name="login")
*
* #Template
*/
public function loginAction(Request $Request)
{
$Session = $this->get('session');
if($Request->attributes->has(Security::AUTHENTICATION_ERROR)){
$loginError = $Request->attributes->get(Security::AUTHENTICATION_ERROR);
} else {
$loginError = $Session->remove(Security::AUTHENTICATION_ERROR);
}
$loginForm = $this->createForm(LoginType::class, array(
'username' => $userName = $Session->get(Security::LAST_USERNAME)
));
return array(
'loginError' => $loginError,
'loginForm' => $loginForm->createView()
);
}
Twig of above
<button type="button" class="btn btn-success btn-sm" data-toggle="modal" data-target="#loginForm">
Zaloguj
</button>
<div class="modal fade" id="loginForm" tabindex="-1" role="dialog" aria-labelledby="myModalLabel">
<div class="modal-dialog" role="document">
<div class="modal-content">
<div class="modal-header">
<button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">×</span></button>
<h4 class="modal-title" id="myModalLabel">Logowanie</h4>
{% if loginError is defined and loginError is not null %}
<div class="">
Blad i chuj: {{ loginError.message }}
</div>
{% endif %}
</div>
<div class="modal-body">
{% form_theme loginForm 'bootstrap_3_layout.html.twig' %}
{{ form(loginForm, {'action': path('_check_path')}) }}
</div>
<div class="modal-footer">
{{ render(controller('CommonUserBundle:Login:rememberPassword')) }}
<button type="button" class="btn btn-default" data-dismiss="modal">Zamknij</button>
</div>
</div>
</div>
</div>
So as i said, i render this form on other twig tempalte and after i click SUBMIT my Request->getMethod is GET. In html all is ok method="post", when i create other Route only to this form his own (not rendered) its working ok. How to change it to work ok?