you can change the recordset code on the Products Results page from:
$query_WADAProducts = "SELECT * , coalesce((select ps3_productoptions.GroupingID from ps3_productoptions WHERE ps3_productoptions.ProductID = ps3_products.ProductID limit 1),ps3_products.ProductID) AS GroupingID FROM ps3_products WHERE ProductLive = 1 GROUP BY GroupingID ORDER BY ProductName";
to:
$query_WADAProducts = "SELECT * , coalesce((select ps3_productoptions.GroupingID from ps3_productoptions WHERE ps3_productoptions.ProductID = ps3_products.ProductID limit 1),ps3_products.ProductID) AS GroupingID FROM ps3_products WHERE ProductLive = 1 GROUP BY GroupingID ORDER BY ProductWeight";