AbleCommerce Shopping Cart Software

You have stumbled across a know issue. There are detailed discussions on this in other threads in this forum. If you search you will find. Basically, when using 'search' functionality, there is no conclusive way of determining the order of products if they are in more than one category. You may want to change the implementation not to use the ProductDataSource.Search

Look at this thread for more info: viewtopic.php?f=42&t=15151&p=64987

In summary, in order to follow the admin sort you'll need to use Category.CatalogNodes to get them back in the proper order. Look at CategoryGrid4 as an example.