All subcategories show up on each main category page after build.

I am moving Links from Hypermart to pair.com and find I cannot use Build All (stops before building all Detailed pages). I tried Staggered Auto but this does not build pages properly, so I use Staggered manually. This works fine but all sub-categories are now listed in the main category pages, not drill-down like before. I have some 1,500 links in the database, organised into 12 main categories and then sub-categories.

How to get a proper Build?