AMC On Demand listings

We watch walking dead using "on demand" as we go to bed early. When we review the on demand listings, the episodes always show up quickly in HD but often are skipped or missing in non-HD. Today when I first checked there was still no #505 or #506 (talking deads were there) but there were four items compared to eight in the HD version. When I checked back later there was nothing there but red text saying to check back later, while the other channels had regular listings. Is there an issue with AMC?? Help!