All products have same link

[Merinid]

Hello, 

 

On my prestashop website I have a problem.Currently I have 2 products, the website works well.

 

But when i add a third product, the others two products have the same link. 

 

For example : 

 

 

when i add the third product, all products have this link when I click on one product : 

 

http://www.mywebsite.com/index.php?id_product=11  

 

 

 

Sorry for my english. 

 

Thank you,

Merinid