do you have any example logs from your postgres instance demonstrating this?
I've exposed raw data from my PostgreSQL tables. And every single new comment and post you could see +1 going on every known server. I haven't updated to 0.18.3 yet, so it's still there: https://lemmyadmin.bulletintree.com/query/raw_site_aggregates?output=table
I see the posts from 2 days ago on lemmy.ml copy https://lemmy.ml/c/guildwars2@lemmy.wtf?dataType=Post&page=1&sort=New
Try sorting by new? Are you using an app? Try not logged-in?
There are settings like hiding read posts that you might have turned on.