So I had made a post regarding sorting posts not working, but I have noticed another issue where some communities just don’t have some older posts. I have tried both on web and on android app, and it’s the same, tweaked some settings too. A demo video (GIF) showcasing the problem and my account settings are attached in below Imgur link: https://imgur.com/a/8X8AQpI
I think you have to select multiple languages in settings.
Select “Undetermined, English, and any others” (and then save).
(this language setting affects the web app, mobile app, and search results)
That might fix it buddy.