Beehaw defederated from my instace lemmy.world, so they may have defederated from your instance too (idk anything about lemmy.one). this means that beehaw users won't see your posts and I think you won't see new posts from beehaw, only old stuff that lemmy.one saw before the defederation
you can think of Lemmy kind of like a Minecraft server. maybe the lemmy.one Minecraft server has all your friends on it while the beehaw Minecraft server has lots of new people. maybe some of your friends are on both servers.
maybe lemmy.one has banned some blocks like tnt to prevent griefing, so if you visit that server you won't be able to blow stuff up, but in lemmy.one tnt isn't blocked so you can explode things to your hearts content. either way, whichever server you play on, you're still playing Minecraft.