diff --git a/grade/edit/tree/lib.php b/grade/edit/tree/lib.php
index 0a393b6a746d1..af79fbfd83a44 100644
--- a/grade/edit/tree/lib.php
+++ b/grade/edit/tree/lib.php
@@ -276,7 +276,7 @@ public function build_html_tree($element, $totals, $parents, $level, &$row_count
             }
             $categoryrow->attributes['data-aggregation'] = $category->aggregation;
             $categoryrow->attributes['data-grademax'] = $category->grade_item->grademax;
-            $categoryrow->attributes['data-aggregationcoef'] = $category->grade_item->aggregationcoef;
+            $categoryrow->attributes['data-aggregationcoef'] = floatval($category->grade_item->aggregationcoef);
             $categoryrow->attributes['data-itemid'] = $category->grade_item->id;
             $categoryrow->attributes['data-hidden'] = 'false';
             foreach ($rowclasses as $class) {
@@ -350,7 +350,7 @@ public function build_html_tree($element, $totals, $parents, $level, &$row_count
             } else {
                 $gradeitemrow->attributes['data-parent-category'] = $parent_eid;
                 $gradeitemrow->attributes['data-grademax'] = $object->grademax;
-                $gradeitemrow->attributes['data-aggregationcoef'] = $object->aggregationcoef;
+                $gradeitemrow->attributes['data-aggregationcoef'] = floatval($object->aggregationcoef);
             }
             foreach ($rowclasses as $class) {
                 $gradeitemrow->attributes['class'] .= ' ' . $class;
diff --git a/grade/tests/behat/grade_edit_tree_bulk_actions.feature b/grade/tests/behat/grade_edit_tree_bulk_actions.feature
index 6e312a8000939..43b9afc858588 100644
--- a/grade/tests/behat/grade_edit_tree_bulk_actions.feature
+++ b/grade/tests/behat/grade_edit_tree_bulk_actions.feature
@@ -253,7 +253,8 @@ Feature: Teachers can perform bulk actions on grade items and categories in the
     And I press tab
     And the focused element is "Move" "button" in the "Move items" "dialogue"
     When I press the enter key
-    And I wait to be redirected
+    And I wait until the page is ready
+    And I wait "2" seconds
     And I press tab key in "region-main" "region"
     # Confirm that 'Grade item 1' and 'Grade item 2' have been moved to 'Category 3'
     And I click on grade item menu "Grade item 1" of type "gradeitem" on "setup" page