Page Inserting Twice Into DB

[eluser]Unknown[/eluser]
For some reason this code is inserting into my DB twice sometimes. Not all the time though.

Code:

<?php
class Clock extends Controller {

    function Clock()
    {
        parent::Controller();
        $this->load->model('Local_Functions');
    }
      
    function index()
    {
        if ($this->session->userdata('logged_in') != '1')
        {
            $data['status'] = 'You are not autorized to view this page.';
        }
        else
        {
            $data['status'] = 'You have reached this page in error.';
        }
        $this->layout->buildPage('member_view', $data);
    }
    
    function timein()
    {
        
        if ($this->session->userdata('logged_in') != '1')
        {
            $data['status'] = 'You are not autorized to view this page.';
        }
        else
        {
            $data['nlinks'] = $this->Local_Functions->getLinks();
            $idata = array(
               'user_id' => $this->session->userdata('user_id') ,
               'time_entry' => time() ,
               'in_out' => 1
            );

            $this->db->insert('time_clock', $idata);
            
            $data['status'] = 'You have been clocked in.';
        }
        $this->layout->buildPage('member_view', $data);
    }
    
    function out()
    {
        if ($this->session->userdata('logged_in') != '1')
        {
            $data['status'] = 'You are not autorized to view this page.';
        }
        else
        {
            
            $data['nlinks'] = $this->Local_Functions->getLinks();
            $idata = array(
               'user_id' => $this->session->userdata('user_id') ,
               'time_entry' => time() ,
               'in_out' => 0
            );

            $this->db->insert('time_clock', $idata);
            
            $data['status'] = 'You have been clocked out.';
        }
        $this->layout->buildPage('member_view', $data);
    }
}
?>

Any Suggestions?