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.
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.