Thanks for bringing this to our attention! I've let the On Demand team know and it should be resolved shortly. Here's what I can see:
This Is Us - S5 E5 & E6 available, E7 missing, E8 upcoming.
Big Sky - S1E1-7 available, E8 missing, E9 available.
Young Sheldon - S4E4-6 available E7 missing, E8-9 upcoming.
Does this match with what you see?