Sounds like somehow some/all of the FS threads thought (maybe incorrectly) that you had marked them up as 'read, forever' .. although why the higher level was showing new posts I dunno ('glitch' springs to mind) - normally the higher level will agree (which is why we mark threads as 'of no further interest' in the first place .. so the forum doesn't get waved at us again).
General Systems Vehicle Three Minds in a Can .. bringing The Culture to a Supercluster near you. (Iain M. Banks, R.I.P.)
NB 'Moderator' superpowers extend to forum mechanics and rules interpretation. Anything else mentioned is (at best) a personal opinion.