Clearly after you handle the bridge handle.
Your post is on blahaj. kbin (or any federated instance) copied a version to their server so their users will see it in their "everything" feed. Kbin user comments on the post. kbin syncs that comment with all federated servers. Kbin isn't federated with hex so that comment doesn't get sent here and you won't see it on hex's copy of your post.
When I first joined this was a common complaint for posts that were made before a community defederated. Basically a post and its comments are copied to each federated instance and then synchronized as long as the instances remain federated. kbin users are commenting on kbin's copy of the post which is then synchronized to any server that is federated with them.
Gifs are for the destination, videos are for the journey.
I shall lend a hand!