I sent the requesting admin from Kbin.earth screenshots and example thread links in DM, and with his or her permission, am sharing the most relevant part of the exchange here for the devs /admins:

Maeve
Compare: https://kbin.earth/m/comradeship@lemmygrad.ml vs https://lemmygrad.ml/

1 week ago
blued_gear
I will take a closer look at the issue once I’m back from vacation. What I found in the server logs 'til yet was not very conclusive, except some errors coming from the Lemmy side (but I can’t say if they are the real reason).

@dessalines@lemmy.ml

  • Maeve@kbin.earthOP
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    8 hours ago

    The only way to see mod history on kbin/mbin is by digging through modlogs, one tedious page at a time, in reverse chronological order (and that assumes the mod actually lists a reason for the moderation). However, these modlogs do show information other modlogs don’t.

    ETA: it’s not because she is moderated, though. It’s because of the federation issues. I just listed one example here.

    • I guess my point is that the federation issues seem to affect specific users, then. I poked at threads some more until I found nearly exactly the same issue with Cletus - history ends ~a month ago, more recent comments haven’t federated.

      If it’s not an issue with having been moderated on kbin.earth, it still seems oddly user specific, and at least possibly time correlated for the two examples I’ve found so far. That might make it easier for blued_gear to figure out more about what goes wrong.