This is a feature of the Shopify theme your store is built on. The data is fake and randomly generated. 

You can change or disable this feature by opening the theme editor, clicking the "Home page" dropdown menu at the top, then clicking "Products" then "Default Product". Then, click "Product top layout" then scroll down to "Products has been sold".

You can then uncheck the box to disable the feature, or change the numbers that it has to pick from for each "Number sold" or "Last X hours"