This led me to @neatchee, who is the instance owner. You might try following them, but I agree, that's an odd bug.

Thanks, it's worth a shot.

If a post contains a hashtag that is taken by another magazine, that magazine usually gets the content instead of yours. Your magazine's hashtag has to appear first in the text. Your Japanese forum is probably catching all of the #japanese posts before they get to LearnJapanese.

So it seems as if @japanese gets priority of the #japanese hashtag due to it being the name of their magazine? Or possibly that they had the hashtag first? I hope multiple magazines are able to federate the same hashtag eventually. @Acala, the admin of @japanese has been inactive for the past few weeks. That's rather unfortunate, as the magazine has no published threads in addition to an inactive moderator.

Second, it's random which of your magazine hashtags will pull content and from who.

That's unfortunate, but helps to clear things up.

The only way to ensure a post gets from Mastdon to Kbin or Lemmy is to put @yourmagazine@kbin.social in the post tag. This will make sure it shows up on Lemmy, and will get your post to the Kbin Microblog of the magazine 90% of the time. If you want to be extra sure, do it like this:
@yourmagazinename@kbin.social #yourmagazinename (then any following hashtags)

This has been very informative, thank you. I'm probably not gonna bug #mastodon users to add this to their posts, but if I ever decide to use mastodon myself I'll keep this in mind.

Hopefully the update will clean this up a bit.

Agreed, kbin as a platform is the most interesting for me, and I hope to see things turn out well.