I think in these cases “unknown” means “not listed for specific treatment”, so it means those domains (etc) are not set up with scores in the addon.
Why the users are getting moderated isn’t clear. A score of 0 would usually mean there’s nothing much wrong but something is triggering that...
Known bug in xenforo 2.2.10, should be fixed in next release. There’s a workaround given in the bug thread.
https://xenforo.com/community/threads/e_warning-attempt-to-read-property-result_count-on-null.207377/