Amazon organizes all of its products by Amazon ID Numbers or ASINS. Reviews on Amazon are also organized by ASIN.
When an Amazon product page has only one product there is only one set of reviews for Fakespot to analyze.
However, when an Amazon product page has multiple versions of the product (sizes, quantity, colors, features, etc) there will be multiple sets of unique reviews for Fakespot to analyze. These are also known as product variations.
When this happens, you may notice different Fakespot Grades for what seems to be the same product, but it is not the same product because each product has a unique UPC and on Amazon a unique ASIN.
Fakespot analyzes products by ASIN to provide the most accurate eCommerce protection because one variation of the product might have been used to seed the Amazon listing with fake reviews in order to drive all product variations sales.