I just clicked on a post and was shown the text from another post

In the mlem community, I clicked on this post:

https://lemmy.ml/post/1223230

I was shown the title and post abouta protest taking place at Reddit HQ and in Ireland. You can see in the screenshot, the post doesn't really match the community and you can see it was posted to the Reddit community. The comments were all about the mlem app.

There was another post I saw earlier today about someone being shown another user's page when refreshing. Very interesting.