04ac3695_se_Notes___Amazon_Web_Services__Issue
[Description] In an ItemSearch request where Sort=salesrank, you would expect the items to be returned in order of their sales rank from best (1) to worst (large number). The sales rank values for items change frequently. The ECS sales rank updates lag behind the sales rank updates on the retail website. So, in an ItemSearch request, although the sales rank numbers are out of order in the ECS response, the items are, in fact, ordered according to the sales rank computed on the retail website. In this way, the sales rank order of items returned by ECS and Amazon’s retail website match. One alternative in the US locale is to use the TopSellers response group to get the top 10 bestsellers. Those items are returned in order. [Impact] Do not use ItemSearch requests that are sorted by Salesrank. [Issue] 
Items sorted by salesrank are returned out of order.
Release: Amazon E-Commerce Service on 2007-07-23 : Release Notes : Amazon Web Services