I think it's rather an algorithm difference, since what I checked in the app, mobile, and desktop all have differences in their listings (some series exists in all platform). I don't know for now though, since the Apple nation attacked. I also might be wrong.
Anyway I hope it's algorithm difference as perhaps it's determined exclusively by people who use different medium, and it sucks for us to be under terror of Apple censorship. I also think the difference is beneficial so some series will have chance to shine and some won't dominate.