Excellent question, Kurlee! It took me a while to figure that one out. The rating on the main/search page is based on the testing of G&M, Lisa, and I. The other reviews have a Average Member Rating under User Reviews, and that you can see when you see the whole product page.
I can see your point about it visually appearing that product hasn't been reviewed at all. Maybe you can PM G&M and see if their programmer can change the logic to figure in all reviews. I kinda miss the numeric rating (like 3.4 or 2. that can show the gray area between different products. But the curls are so cute!