add to cart is not working on mobile

My website is working well on tablet and desktop. However, when I want to order on a mobile phone (Android), the add to cart button is not working well. If you click it, the color changes, so something is happening, but it does not add any products to the cart.
I have tried anything I could think off, but I don’t have any idea what could cause this issue or how to fix it.

I hope someone can help me with this.

Kind regards, Jeannette

The page I need help with: [log in to see the link]