Hello,
You added Upsells and Cross-sells products https://docs.woocommerce.com/document/related-products-up-sells-and-cross-sells/
Cross-sells appear on the cart page after adding your product to the cart. Upsells could appear on the single product if you add the appropriate element to product layout http://prntscr.com/sxbkfe
Related products http://prntscr.com/sxbj9m is a section on some templates that pulls products from your store that share the same tags or categories as the current product.
These products cannot be specified in the admin, but can be influenced by grouping similar products in the same category or by using the same tags.
Regards