Why do posts that aren’t from kbin show “kbin.social” next to the title?

CarlsIII@kbin.social to /kbin meta@kbin.social – 92 points –
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So I’m on kbin. And your comment can be described as

On kbin.social from k.fe.derate.me

And my reply when you see it would be

On k.fe.derate.me from kbin.social