Magnum PI showing 16 episodes, should be 20

I’ve had a few issues with SeriesGuide not having all the correct episodes, usually missing more recent episodes or the meta data isn’t showing (episode name/description).
Most recently, Magnum ( which should have 20 episodes.
Any idea whats going on?

Well after hitting manual sync several times over the last few hours, it has finally updated Magnum PI to 20 episodes