Product details multilanguage sef

[fabioweb]

Hello, i have a mistake..
this is a product category page: http://dev.visionexperience.eu/occhiali-da-sole/occhiali-da-sole-rayban
if i click on a product i get sef product details url like: http://dev.visionexperience.eu/occhiali-da-sole/rayban-2140-901-50-22

The same category by english side: http://dev.visionexperience.eu/en/sunglasses/sunglasses-rayban i get:
http://dev.visionexperience.eu/en/component/virtuemart/rayban/rayban-2140-901-50-22?Itemid=1236

How can i fix?
Regards