lemmy.world is down right now and your app is showing the raw HTML that is being returned (a CloudFlare 502 page)
You might try registering at a less crowded instance - you'll have access to the same content but it will be faster and with less problems.
You can do that, but if you don't want 20 different accounts, I would recommend signing up to just one. Lemmy and any other federated social media system should push posts from other servers to your feed depending on what servers are in region.