Express Theme Clicking on add to cart button from desktop version

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We have the express theme and when using the website from a laptop/desktop and clicking on Shop and then a product and then on the Add to cart button, the product is not added to the cart.

When using the same online shop from a mobile device, clicking the add to cart button, does work and the product is added to the cart and can proceed to check out.

What is wrong, please help!

Thanks so much in advance