https://lemmy.nz/post/32375 was showing the below at some stage, as well as different title and content and content changing
https://lemmy.nz/post/58520 seems to be a report of the same bug on lemmy.world
I've seen this as well!
Then you refresh and it all goes back to normal. Very annoying when you're trying to write a reply and suddenly the post changes!
Like you mentioned, not a lot we can do. There's an update due next week, it's focused on performance not bug fixes. But part of the performance changes involve changing how the website communicates with the server so perhaps we'll get lucky and this will get resolved.