Server Version#: Version 1.18.4.2171-ac2afe5f8
This list of movies is sorted by resolution:

Note how the movie in the bottom left shows as “1080” but is sorted among “SD”.
There are two copies of the movie (thus the “2” top left on the cover), one in SD and one in 1080.
This seems like a bug. It should probably either show both resolutions, or the one that it seems to sort on, which is “SD”.
And I do realise a workaround would be to remove the lower-res version 