"Add to Cart" button on home page doesn't work

[Adorzz]

For some reason "Add to Cart" button on home page doesn't work. Option "Same Page Add To Cart" enabled.
Customer is redirected to product page and no items added to cart.

Button "Add To Cart" works on product page only, shopping cart displaying the item and customer is taken to checkout.

On your Demo store this option (on home page) works... button changing to "added to cart" and customer can continue shopping.

How can I solve this problem?
Thanks.

[Basara]

Please check this one

[Adorzz]

Thanks, I've got it. It doesn't work because our items have multiple size options available in the dropdown menu.