Wrong product in cart

For some reason my "Add to cart"-button on the product listing page doesn't work correctly. When I use the button "Add to cart" ("In winkelmandje") the wrong product is added to the cart. It looks like it's adding the first product on the page. My page is here

That's because you customized the view and then updated. You need to edit the file listing_img_desc of the view product that you customized to add the line below at the beginning:
$this->ajax='';

You're right. I'm sorry, indeed I edited and uploaded an older version of the file. Thanks!