New issues with form validation

it still doesn't work!! The form resets with all values intact except for password and confirm password because I didn't do set_value() on them in the view file. Something very odd happens tho, the set value for username resets and becomes that for last name leaving the username blank and displays an error saying the username is required meanwhile I had previously filled the username before hitting the submit button. The url then becomes http://localhost/busticket/index.php/user/register_user. Really need help!!!