If I open: https://lemmy.world/c/lemmy_support@lemmy.ml and https://lemmy.ml/c/lemmy_support in 2 different tabs, I don’t see the same posts at all, even with the same sorting option selected.
Is it just because the servers are overloaded and there is some delay in the synchronization?
I might be experiencing something similar. I saw different posts under “All” before and after logging in, even using the same sort (“New”). But in both cases I’m viewing from my home instance.