Problem with the url of the categories virtuemart

I load the file for virtuemart sef but I do not understand why they do not "translate" the url of the categories of VirtueMart and refer it this way:
mystie.com / index.php? option = com_virtuemart & page = shop.browse & category_id = 21 & Itemid = 53
As they click on a product any URLs are rewritten correctly.
Thanks

stefano

The "translation" is up to the component. If it doesn't display the SEF link somewhere it means it doesn't use the SEF function on that place. So you should ask the component author about that.