It just happened to me upvoting a post in this thread :(
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[email protected]:That was fixed since time ago. It affected me too. Clear your browser cache for Kbin and try again.
If it persists it might be an unrelated issue.
Kbin has some unique features like: blocking an entire instance per user, seeing who votes on a post without being an instance admin, and access to the "microblog" parts of the fediverse.