You could also try using Sets to do this Top 10 - you might find it works better with fewer issues. Filtering on those only within the set and removing the Top 10 from your category field, leaving it as 'relevant values', should still only show the correct 10 categories within the filter. Alternatively you could show the set contents as your category filter. Check this link out if what I've written means nothing - and experiment a little with it, sets are useful: Sets
Thank you!! That worked perfectly!!