$grademenu = make_grades_menu($this->get_instance()->grade);
if (count($grademenu) > 0) {
$gradingelement = $mform->addElement('select', 'grade', get_string('grade').':', $grademenu);
+
+ // The grade is already formatted with format_float so it needs to be converted back to an integer.
+ if (!empty($data->grade)) {
+ $data->grade = (int)unformat_float($data->grade);
+ }
$mform->setType('grade', PARAM_INT);
if ($gradingdisabled) {
$gradingelement->freeze();