Hey @simon_pepper,
After reviewing your account information, I see that you’re running early access, as well as an outdated mobile-exe build that is no longer active. Having different builds across devices may very well be the culprit behind what you’re seeing.
Outside of that, I would review your iOS Roon settings and see if ‘Show hidden tracks and albums’ option is enabled. If not, turn it on and let me know if that clears things up for you.
Thanks!