I have build_search_gb set to yes but I notice that if results are spanned over a few pages it lists some of the same categories again with other results.

If I up the limit of search_maxhits to show all the results on one page it displays correctly.

Does it have anything to do with build_sort_order_search / build_sort_order_search_cat set as 'score' and what alternative default sort orders can be used in these fields?