The upsell products of an offer will always be visible on the Upsell pop up even if it is added to cart. But if the product is already added to cart or add to cart from the Upsell pop up then the link  \"Add to Cart\" will be converted with \"Added\" button on the product block. i.e. If the product is added to cart an \"Added\" button with no link will be visible in the place of \"Add to Cart\" button. The user can\'t add the product to cart on such cases.nnThis is the working format of \"Unlimited Upsell\" app of Shopify web store that we have used as a model to implement the feature on Infiniistores. So it is not a bug. The feature is working fine.