Yeah there is some lag in the indexing, I do scrape all the HN submissions but like once a week (it's in plans to make this immediate but haven't gotten around to it yet). Just to make sure, if you go to one of those other pages on the same domain, do you see the the HN threads/comments in the sidebar on that page?
Ok yeah that's just the indexing. I am using the bigquery HN dump to index, but using their free quota I can go through the archive only ~once a week. Ideally ampie would just go through the new submissions regularly using the HN api, but I haven't built that yet.