Yup. Since fedia.io was federating with ani.social for awhile you’ve got a “local copy” of ani.social’s communities on fedia.io from back when it federated.

So when you post on those communities it’s all happening only on fedia.io and you see posts/comments on that community from other fedia.io users. But, for example, I can’t see what fedia.io local copy of anime@ani.social looks like from my instance, because my “local copy” is still federating with the actual instance anime community is hosted on (i see new posts and my posts/comments get sent first to ani.social’s original community and federates to rest of instances from there).