I deleted a post after I accidentally posted it twice from two different accounts (on sopuli and fmhy).
The deleted post was as I expected gone from my sopuli account, but from my fmhy account I can see that both posts are still up. People can still see and comment on both. I just can no longer see it.
Just a hypothesis:
Could it be, that post creation is synchronised between federated instances, but deletions are not?
If that’s the case, nothing could ever be deleted from Lemmy - but that wouldn’t be Jerboa’s fault.