Why do some posts disappear, but can still be voted?

Yesterday I saw a post about the Reddit IPO and commented on it. The post was on c/World News of Lemmy.World and seemed to just have been posted since it had no comments.

I then kept scrolling as usual and found out that the same exact post with the same title had already appeared on c/Technology of Lemmy.World with lots of comments and votes, so I understood the first one I saw was a repost and this was likely the original post and I decided to write the same comment again.

Now something interesting happened. I use Eternity and see my two identical comments being up or down voted and someone replied to my first comment (and I can see this reply in my inbox), but I cannot access the first post anymore (it says "error refreshing the page")

Thought the first post had been taken down because perhaps the original poster or mods decided it was a repost, but I woke up this morning and both of my comments keep being voted, so someone must be able to see both posts!

How is this possible?

Edit: fixed grammar