MAGETWO-81942: Magento 2.2.0 A solution for Product Repeat Issue after filter on category listing page. magento#11429

Author: ishakhsuvarov

app/code/Magento/Catalog/Block/Product/ProductList/Toolbar.php

@@ -192,7 +192,14 @@ public function setCollection($collection)
             $this->_collection->setPageSize($limit);
         }
         if ($this->getCurrentOrder()) {
-            $this->_collection->setOrder($this->getCurrentOrder(), $this->getCurrentDirection());
+            if ($this->getCurrentOrder() == 'position') {
+                $this->_collection->addAttributeToSort(
+                    $this->getCurrentOrder(),
+                    $this->getCurrentDirection()
+                )->addAttributeToSort('entity_id', $this->getCurrentDirection());
+            } else {
+                $this->_collection->setOrder($this->getCurrentOrder(), $this->getCurrentDirection());
+            }
         }
         return $this;
     }