I know I’m rather late on the response here, but my understanding is that each instance takes some time to discover the existence of a mag/community on another instance, particularly as it only checks the first time somebody searches for it (on that instance). I have unfortunately noticed that Fedia is often very slow for this. It took a week or two to pick up a small visual novels community I looked at a couple months back, and it still hasn’t picked up @RimWorldPorn_General (SFW), which I searched for 3+ weeks ago.

Whether this is a Fedia-specific issue, a kbin issue, or something else I’m not sure. You might be able to get more input from asking on one of the larger fediverse-focused subs like @fediverse or @fediverse .