Laravel phpunit test is failing. Going to an unexpected page. Only happens in the test

So, I have a page with a button on it with the value "Create". When I click that Create button, without filling out any of the fields, it validates the form and displays error messages on the same page. When I do that in the browser, it works fine, but when I do it with phpunit, it has unexpected results and I do not know why.

Here is my integration test:

public function testCreateValidation()                                     
{ 
    $this->visit(route('patients.indexes.create', $this->patient->id));    
    $this->press('Create');                                                
    $this->seePageIs(route('patients.indexes.create', $this->patient->id));              
}   

And this is the result:

There was 1 failure:
1) Tests\Integration\IndexControllerTest::testCreateValidation
Did not land on expected page [http://localhost/patients/69/indexes/create].

Failed asserting that two strings are equal.
--- Expected
+++ Actual
@@ @@
-'http://localhost/patients/69/indexes/create'
+'http://localhost/patients'

/vagrant/vendor/laravel/framework/src/Illuminate/Foundation/Testing/InteractsWithPages.php:141
/vagrant/tests/Integration/IndexControllerTest.php:51

I don't understand why it is being redirected to the patients page.

Here is the Laravel create method that is being tested:

public function create($id)                                                         
{                                                                                   
    $index = $this->indexes->newInstance();                                         
    $patient = $this->patients->findOrFail($id);                                    

    return view('patient.index.create', ['index' => $index, 'patient' => $patient]);
} 

And here is the relevant section of the create view:

<?= Form::open(['route' => array('patients.indexes.store', $patient->id), 'class' => 'form-horizontal']) ?>
    @include('patient.index._form')
    <?= Form::submit('Create', ['class' => 'btn btn-primary']) ?>
<?= Form::close() ?> 

And finally the store method that it is being sent to:

public function store(IndexRequest $request, $id)       
{                                                       
    $index = $this->indexes->newInstance();             
    $index->fill($request->all());                      
    $index->patient_id = $id;                           
    $index->save();                                     

    $patient = $index->patient;                         

    return redirect()->route('patients.edit', $patient);
} 

I am also using a FormRequest to validate the input:

public function rules()                   
{                                         
    return [                              
        'index_title' => 'required',      
        'index_description' => 'required',
    ];                                    
}  

So essentially, since it is failing the validation in the IndexRequest, the IndexRequest should kick it back to the patients.indexes.create view and display errors. But for some reason it's being kicked to the patients page (this ONLY happens in the test, if I try it out by manually clicking the Create button in the browser, it works as expected)

I've had this issue before but have never been able to solve it. Any ideas?