Are upvotes/downvotes supposed to federate? Even between lemmy/kbin instances?

As an example, I have this post. On my instance the.coolest.zone, it has 3 upvotes.

The post federated to lemmy.ml as this post, and currently has 37 upvotes.

Am I missing something? I'd totally expect those upvote counts to be shown on my instance as well.