It was answered in the other thread

You’re on piefed. So it was posted to a different community first and you are looking at a cross-post. PieFed stitches cross posts together so you see all the comments from all posts under a single one.

Your instance either defederated anarchist.nexus, the other way around or some other federation issue. You can always read the post on OPs instance if something seems to be missing. At least Lemmy UI has a link to the post on poster’s instance