Episodes in calendar - difference between web and mobile rules

Seems that the rules used to decide what series episodes appears in the calendar, differ between web and mobile versions. Why? As far as I can tell …

Web Instance

  • Episodes of any shows that are in my watchlist
  • Episodes of any shows that are in my library

Mobile Instance

  • Episodes of any shows that are in my watchlist
  • Episodes of shows in my library, but limited to only those shows that have already been partially watched

For example, episodes of Pluribus and The Last Frontier appear in my Web view (because some episodes are already in my library), but not my Android view. Neither series is in my watchlist, because they’re already (at least in part) in my collection. Both series are unwatched.

Why the difference between Android and Web views?