Not all subcategories/products displaying

Recently, some subcategories and products are not displaying when their parent is selected. For example, there are 26 products in the sub category “chironomid fly patterns”, but when “chironomid fly patterns” is selected it displays only one of those 26 products (https://www.customtroutflies.ca/product-category/fly-patterns/chironomid-fly-patterns/). I not not made any settings changes. Any help would be greatly appreciated ..

The page I need help with: [log in to see the link]