diff --git a/weight.module b/weight.module
index e466f6f..68aca3d 100644
--- a/weight.module
+++ b/weight.module
@@ -17,7 +17,10 @@ function weight_preprocess_views_view_table(&$variables) {
       foreach ($variables['rows'] as $key => $row) {
         $variables['rows'][$key]['attributes']->addClass('draggable');
       }
-      $table_id = 'weight-table-' . $variables['view']->dom_id;
+      // The row key identify in an unique way a view grouped by a field,
+      // otherwise all the groups will share the same table_id and just the
+      // first table can be draggable.
+      $table_id = 'weight-table-' . $variables['view']->dom_id . '-row-' . $key;
       $variables['attributes']['id'] = $table_id;
 
       $options = [