As i understand the account migration tools for Kbin are not ready yet.
On Mastodon/Calckey and other more developt project you can ex/import the list of your followers etc and even fully transfer an account from server to server.
We might need to wait a little for that feature beacause there are other things "more important" like stability of the server and moderations tools to combat spam etc
Its working for me as expected. I only the the subs i sub to.
Edit: Found a Theard in a Sub that i do not follow BUT i follow the creator of the thread. I guess that might be a thing ?