Ticket #21082: 21082.diff

wp-includes/media.php

@@ -840 +840 @@
         $itemwidth = $columns > 0 ? floor(100/$columns) : 100;
         $float = is_rtl() ? 'right' : 'left';
 
-        $selector = "gallery-{$instance}";
+        $selector = "gallery-{$id}-{$instance}";
 
         $gallery_style = $gallery_div = '';
         if ( apply_filters( 'use_default_gallery_style', true ) )