This usually happens because MineWhat is not recieving transaction data from your store. Transaction data also includes add to cart events and revenue information as well, so those insights will not work as well.
This is more likely to occur for stores that are on standard platforms like Shopify, Magento, Opencart and so on. The best thing to do in these cases is to check to see if all the steps in the integration were completed. For more information on the installation for each platform, please click here. Also do write in to us at firstname.lastname@example.org.