Not that this helps OP, but on topic of “weirdness” in the Fandango module: I have an SD movie in my library purchased years ago that I found was also available to watch free in HDX. However, because I only own the SD veersion of the movie, when I try to download it in SF I can only get SD quality - no higher resolution is offered. It seems Fandango (or StreamFab?) limited my download for that title to resolution of the movie I owned, even though higher quality was avaialble free. (For the life of me I can’t remember or find the movie now out of the over 500 in my library. I’ve been grabbing a LOT of movies lately.)
I don’t know if anyone else encountered that (download was limited to their owned resolution if a free version in higher quality was avaialble) but to get around this limitation I thought for half a minute about creating a dummy account so I can login with that to grab the free HD version of the movie - but it wasn’t worth the effort.