I'm pretty sure that Koha used to hide closed baskets that have everything in them received from the search results when doing a vendor search. Now every basket shows and for libraries that have lots of orders it slows down the vendor search results page and makes it unwieldy. There should be a preference to hide closed/received baskets or it should just hide them so that this is not an issue.
*** This bug has been marked as a duplicate of bug 9824 ***