If you sort comments by upvotes in your app, you will see what happened as the top comment. But it was a temporary problem, no need to panic for that reason.

But I agree with others, users should spread out to more instances to help keep the fediverse healthy and other instances active. Otherwise we encourage Reddit 2.0.

I have never used lemmy.world myself, because it goes against the fediverse idea to flock together on the same instance.