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I thought one account in any instance is enough and thats how lemmy works. Why do I have to sign up on all these individual instances to comment?
It probably means that you have enabled the “everything feed” in liftoff settings. This aggregates content from all instances apparently, even those not federated with yours.
Edit: weird cause you seem to be on sh.itjust.works which is federated with Lemmy.world.
There is a difference with adding an instance and accessing it that way (via their API - bypassing the server you signed up on) and via federation using the server you signed up on. Only in the latter case can you vote using the account already registered.
Try using the search feature to access the community via federation (e.g. “!cats@lemmy.world”) rather than adding the instance directly.
An account on one instance lets you interact with all other instances, but only via that instance, not directly. You are probably viewing the “All” feed via an instance you are not signed into. Try this:
Click on the top button:
https://i.imgur.com/0PEHYsK.jpg
Select “all” for the instance you are logged in for, for example I am logged in via Lemmy.fmhy.ml: