The top 3 clicked products are the most clicked for the last month (30 days). There could be several reasons for these products to not show in Amazon now but most likely they are not available anymore:
They've run out of stock recently - Amazon will not show them in the search results even though they were the most clicked products.
When doing product research we generally recommend using USA shipping address. If your shipping address is in AU, Amazon will not show products which doesn't ship to AU. If the top 3 clicked products don't ship outside of USA, they wont show in the search results.
Amazon blocked the listing. This happens a lot with some Chinese products with fake click traffic like "iphone headphones", "face mask" and similar very popular keywords.