i have not been able to reproduce the error, but one thing to try would be to set the forms action:
action="photographer_category_Update.php?Id=<?php echo(rawurlencode($row_WADAphotographer_category['Id'])); ?>"
to:
action="photographer_category_Update.php"
then set it back after updating the form with CSS form builder. This is really the only difference between an update and insert form.