diff --git a/module/kanban/model.php b/module/kanban/model.php
index fa626fcf8f..18345be3b0 100644
--- a/module/kanban/model.php
+++ b/module/kanban/model.php
@@ -3007,7 +3007,32 @@ class kanbanModel extends model
         if($column->parent)
         {
             $parent = $this->getColumnByID($column->parent);
-            if($parent->parent != -1) $this->dao->update(TABLE_KANBANCOLUMN)->set('parent')->eq(-1)->where('id')->eq($column->parent)->exec();
+
+            /* If the parent column is normal now, put its card into child column. */
+            if($parent->parent != -1)
+            {
+                $parentCells = $this->dao->select('*')->from(TABLE_KANBANCELL)
+                    ->where('`column`')->eq($column->parent)
+                    ->andWhere('type')->eq('common')
+                    ->fetchAll('id');
+
+                foreach($parentCells as $cell)
+                {
+                    $this->dao->update(TABLE_KANBANCELL)->set('cards')->eq($cell->cards)
+                        ->where('lane')->eq($cell->lane)
+                        ->andWhere('`column`')->eq($columnID)
+                        ->andWhere('type')->eq('common')
+                        ->exec();
+
+                    $this->dao->update(TABLE_KANBANCELL)->set('cards')->eq('')
+                        ->where('lane')->eq($cell->lane)
+                        ->andWhere('`column`')->eq($cell->column)
+                        ->andWhere('type')->eq('common')
+                        ->exec();
+                }
+
+                $this->dao->update(TABLE_KANBANCOLUMN)->set('parent')->eq(-1)->where('id')->eq($column->parent)->exec();
+            }
         }
 
         $this->dao->update(TABLE_KANBANCOLUMN)