When I refresh a page it sends the same data

Code:

//Controller



   function Welcome()

    {

        parent::Controller();

                $this->load->helper('url');

                $this->load->database();

    }



   function forms(){

            $data['header']='input form';

            $data['title']='input form';

            $this->load->model('MForm');

            if ($this->input->post('start_time')){

               $this->MForm->enterform();

                redirect('welcome/forms', 'refresh');

             }else{

                $this->load->view('forms',$data);

            }            

        }



// model



 function enterform(){



        $data = array(

            'date' => $this->input->post('date'),

            'start_time' => $this->input->post('start_time'),

            'finish_time' => $this->input->post('finish_time'),

            'instructor' => $this->input->post('instructor'),

        );

        $this->db->insert('schedules',$data);

     }





// view



&lt;form name="form1" method="post" action="forms"&gt;

    &lt;!-- form 1 --&gt;

<label for='start_time'>1. Start Time</label>

&lt;input type="text" name="start_time" /&gt;

<label for='finish_time'>Finish Time</label>

&lt;input type="text" name="finish_time" /&gt;

<label for='instructor'>Instructor</label>

<select name="instructor">

<option value="john">John</option>

<option value="mary">Mary</option>

<option value="jim">Jim</option>

</select>

&lt;input type="hidden" name="date" value="&lt;?php echo $date; ?&gt;"/&gt;

&lt;input type="submit" name="submit" value="Submit" /&gt;

&lt;/form&gt;

Code:

$data = array(

            'date' => $this->input->post('date',TRUE),

            'start_time' => $this->input->post('start_time',TRUE),

            'finish_time' => $this->input->post('finish_time',TRUE),

            'instructor' => $this->input->post('instructor',TRUE),

        );