When I refresh a page it sends the same data

[eluser]Twisted1919[/eluser]
Everythinbg seems fine, except maybe 2 things :
1) try : redirect('welcome/forms');exit();
2) your form is vulnerable to xss attacks try :

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),
        );