diff --git a/question/type/ddimageortext/edit_ddimageortext_form.php b/question/type/ddimageortext/edit_ddimageortext_form.php
index 9b9f1d831e7..7d499e7f5b9 100644
--- a/question/type/ddimageortext/edit_ddimageortext_form.php
+++ b/question/type/ddimageortext/edit_ddimageortext_form.php
@@ -116,8 +116,7 @@ class qtype_ddimageortext_edit_form extends qtype_ddtoimage_edit_form_base {
     protected function definition_draggable_items($mform, $itemrepeatsatstart) {
         $mform->addElement('header', 'draggableitemheader',
                                 get_string('draggableitems', 'qtype_ddimageortext'));
-        $mform->addElement('advcheckbox', 'shuffleanswers', ' ',
-                                get_string('shuffleimages', 'qtype_'.$this->qtype()));
+        $mform->addElement('advcheckbox', 'shuffleanswers', get_string('shuffleimages', 'qtype_'.$this->qtype()));
         $mform->setDefault('shuffleanswers', 0);
         $this->repeat_elements($this->draggable_item($mform), $itemrepeatsatstart,
                 $this->draggable_items_repeated_options(),
@@ -143,8 +142,7 @@ class qtype_ddimageortext_edit_form extends qtype_ddtoimage_edit_form_base {
                                                 get_string('group', 'qtype_gapselect'),
                                                 $options,
                                                 array('class' => 'draggroup'));
-        $grouparray[] = $mform->createElement('advcheckbox', 'infinite', ' ',
-                get_string('infinite', 'qtype_ddimageortext'));
+        $grouparray[] = $mform->createElement('advcheckbox', 'infinite', get_string('infinite', 'qtype_ddimageortext'));
         $draggableimageitem[] = $mform->createElement('group', 'drags',
                 get_string('draggableitemheader', 'qtype_ddimageortext', '{no}'), $grouparray);
 
diff --git a/question/type/ddmarker/edit_ddmarker_form.php b/question/type/ddmarker/edit_ddmarker_form.php
index 8242691a437..15ff5864e7c 100644
--- a/question/type/ddmarker/edit_ddmarker_form.php
+++ b/question/type/ddmarker/edit_ddmarker_form.php
@@ -44,8 +44,7 @@ class qtype_ddmarker_edit_form extends qtype_ddtoimage_edit_form_base {
     }
 
     protected function definition_inner($mform) {
-        $mform->addElement('advcheckbox', 'showmisplaced', ' ',
-                                                get_string('showmisplaced', 'qtype_ddmarker'));
+        $mform->addElement('advcheckbox', 'showmisplaced', get_string('showmisplaced', 'qtype_ddmarker'));
         parent::definition_inner($mform);
 
         $mform->addHelpButton('drops[0]', 'dropzones', 'qtype_ddmarker');
@@ -60,8 +59,7 @@ class qtype_ddmarker_edit_form extends qtype_ddtoimage_edit_form_base {
     protected function definition_draggable_items($mform, $itemrepeatsatstart) {
         $mform->addElement('header', 'draggableitemheader',
                                 get_string('markers', 'qtype_ddmarker'));
-        $mform->addElement('advcheckbox', 'shuffleanswers', ' ',
-                                        get_string('shuffleimages', 'qtype_'.$this->qtype()));
+        $mform->addElement('advcheckbox', 'shuffleanswers', get_string('shuffleimages', 'qtype_'.$this->qtype()));
         $mform->setDefault('shuffleanswers', 0);
         $this->repeat_elements($this->draggable_item($mform), $itemrepeatsatstart,
                 $this->draggable_items_repeated_options(),
diff --git a/question/type/ddwtos/edit_ddwtos_form.php b/question/type/ddwtos/edit_ddwtos_form.php
index f42b439d0db..84479dd84f8 100644
--- a/question/type/ddwtos/edit_ddwtos_form.php
+++ b/question/type/ddwtos/edit_ddwtos_form.php
@@ -49,8 +49,7 @@ class qtype_ddwtos_edit_form extends qtype_gapselect_edit_form_base {
 
     protected function choice_group($mform) {
         $grouparray = parent::choice_group($mform);
-        $grouparray[] = $mform->createElement('checkbox', 'infinite', ' ',
-                get_string('infinite', 'qtype_ddwtos'), null,
+        $grouparray[] = $mform->createElement('checkbox', 'infinite', get_string('infinite', 'qtype_ddwtos'), '', null,
                 array('size' => 1, 'class' => 'tweakcss'));
         return $grouparray;
     }