Episodes of a show are missing on Cinemax

I just subscribed to Cinemax as part of Roku's Streaming Day Deals promotion.  I started to watch the show Quarry, which was just one season comprised of eight episodes.  But as soon as I finished episode 1, it started to show episode 3.  I went back to the list and noticed episode 2 is not there at all, and neither is episode 6. 

I have never encountered random missing episodes before on any network or any streaming service, but just to show I'm not making this up or looking in the wrong place, here is the list of SIX Quarry episodes (episodes 1, 3, 4, 5, 7, and 8, with 2 and 6 missing):
https://therokuchannel.roku.com/details/e2e436152bb35bdba6437d0a777ee4ec/quarry 

When I look up the episodes of Quarry on Amazon Prime Video, all eight are available there:
https://www.amazon.com/Nuoc-Cha-Da-Mon/dp/B01N91AOPD/ref=sr_1_4 

Even Cinemax's own website clearly shows eight episodes:
https://www.cinemax.com/quarry 

I had no idea that Roku provided truncated or incomplete access to these premium channels.  How and why is Roku missing content that rival streaming services provide?