Add to cart button issue

Hello everyone.
I have a problem with the shortcode [add to cart]. The web so you can see the problem is http://www.mariatolmo.com/probando-comercio/
The button works fine from PC, but when I give from mobile leads to a 404 page.
This is the shortcode i used [add_to_cart id=”6787″]
Any help? Thanks!!!

https://wordpress.org/plugins/woocommerce/