Problem Layered Navigation - Quantity In Stock Not Correct

[biebel]

Hi,

 

 

The quantity of items in stock in the layered navigation block does not corresponds with real quantities.

Example:

 

http://www.greatat8.com/prestashop/index.php?id_category=17&controller=category&id_lang=1#/manufacturer-lion_of_leisure

 

As you can see, there are only 2 shirts in stock but in the layered navigation block there are 5 sizes instead of 2.

Is there something wrong with the attributes definition or is there a problem with the query?

 

Thanks,

Regards,

Bart