That community only accepts posts in ‘undermined’ language, so if you aren’t seeing anything from there, but you can when you log out (to simulate everyone else’s view of it), then it’s probably a user setting that prevents you from seeing stuff from that language. If you go to the ‘collapse’ community and posts by ‘Midnight’ are missing, then it’ll be that (similarly there’s a comment here from ‘originallucifer’ - if you haven’t seen it, it’s 'cos of the language thing).
Interesting. Funnily enough, my comments are coming through to Lemmy as ‘Undermined’ too (just a PieFed bug, easily fixed), so the fact that you saw it (as well as the comments by the others I mentioned) means it’s not a language thing. That’s good, in a way, because it should be physically impossible to actually de-select it.
So, sorry - at least we can rule one thing out, but I don’t have any more suggestions.