Reddit is removing the Direct Message feature, and all active conversations will be archived so you won’t be able to continue ongoing conversations. Reddit also deleted all bad reviews for their app awhile ago. Its rating went from 3.4 to 4.5 stars overnight.
You can set whether you want to view all/subscribed/local in your Lemmy client.
The communities I’m currently subscribed to don’t have that much content so I end up on all frequently. That’s how I keep seeing these posts too.