A really silly question about lemmy instances I believe - Lemmy.world

Hello folks! I created the MetalVinyl a few days ago and was just having a look on some other instances (I am on lemmy world and the sub was also created there - I believe?). Weirdly if I head over to lemm.ee [http://lemm.ee] or beehaw.org [http://beehaw.org] and try to find it, it’s not showing up but I can see other subs from lemmy.world? Did I do anything wrong when creating it? Or is it fully normal that it seems to be only available for lemmy.world? Thanks in advance!