Unlike the other freelancing sites, Fiverr never shows reviews on the buyers profiles. The reason is a vast majority of Fiverr clients are their own guys who bring lower cost projects from their local markets and post those on Fiverr. They want to get their lower cost jobs done for free. As the consequence of it, they try to be involved in a quarrel with the sellers. They do this only to get the job done for free. As the consequence of it, they receive negative reviews in many cases. Now if their profiles show the negative reviews posted by the sellers, they will never get any seller in future to get their works done for free. This is why fiverr Fiverr never shows reviews on the buyers profiles.
On the other hand, as the sellers profiles display the reviews, they deliver the work for free in the most of the cases. This is only to avoid the negative feedbacks and keep their profile neat and clean.
Clients on the fiverr, being their own people, Fiverr always take buyers side. No seller can win against a buyer on fiverr- even if a seller is 100% correct. Fiverr is a site for the buyers, not for the sellers.