diff -u b/modules/cart/js/commerce_cart_edit_quantity.js b/modules/cart/js/commerce_cart_edit_quantity.js
--- b/modules/cart/js/commerce_cart_edit_quantity.js
+++ b/modules/cart/js/commerce_cart_edit_quantity.js
@@ -13,11 +13,13 @@
     attach: function (context) {
       // Click the update button, not the remove button on enter key if we are
       // on a text field.
-      $('form .views-field-edit-quantity input.form-number', context).keydown(function (event) {
+      $('form .views-field-edit-quantity input.form-number', context)
+        .once('commerce-cart-edit-quantity')
+        .keydown(function (event) {
         if (event.keyCode === 13) {
           // Prevent browser's default submit from being clicked.
           event.preventDefault();
-          $('input#edit-submit', $(this).parents('form')).click();
+          $(':input#edit-submit', $(this).parents('form')).click();
         }
       });
     }
diff -u b/modules/cart/src/Plugin/views/field/EditQuantity.php b/modules/cart/src/Plugin/views/field/EditQuantity.php
--- b/modules/cart/src/Plugin/views/field/EditQuantity.php
+++ b/modules/cart/src/Plugin/views/field/EditQuantity.php
@@ -137,10 +137,6 @@
     }
     // Replace the form submit button label.
     $form['actions']['submit']['#value'] = $this->t('Update cart');
-    // Add JS for triggering the Update button when hitting the enter key.
-    $form['#attached'] = [
-      'library' => ['commerce_cart/edit_quantity'],
-    ];
   }
 
   /**
@@ -168,6 +164,10 @@
     $form['actions']['submit']['#show_update_message'] = TRUE;
     // Replace the form submit button label.
     $form['actions']['submit']['#value'] = $this->t('Update cart');
+    // Add JS for triggering the Update button when hitting the enter key.
+    $form['#attached'] = [
+      'library' => ['commerce_cart/edit_quantity'],
+    ];
   }
 
   /**