We've been investigating some recurring issues with the user experience on the instance, and have traced it back to the way Lemmy handles language settings.
Here's the TL;DR on how to ensure you see all of the content on this instance:
In your user settings, make sure "Language" is set to both "English" and "Undetermined". You can select additional languages as well, but they aren't currently allowed on this server.
On desktop, you can use CTRL+click to select both options.
This will allow you to see content for which the author has not set a language, and content which has been set to "English".