There are bugs in Lemmy right now about remote-home-remote instances, moderator actions seem to be one of the most common, as are deletes of comments (but edit of comments works fine). If the community is homed at lemmy.ml, and a change is made on an instance other than that, the code doesn't federate it to the other 1500 instances who might have subscribed to that community. There are some open issues on GitHub going back weeks about some of the issues. I gave a heads up on some of the issues on !mods@lemmy.world
I am actively working on a series of tests to demonstrate these problems. Right now I'm waiting on more critical performance server-crash issues to get merged.