如果您尚未启用缓存，则产品未添加到购物车的原因之一.

如果禁用了缓存，则会显示商品已添加到购物车"通知，但购物车未存储商品

One of the Reason for product not add to cart if you have not Enable cache.

If cache is disable notification is display 'Item added to cart', but cart does not store product