The playlist shortcut shows six playlists, but 2-5 seconds after rendering these, about the same time it takes you scan over them and see if the playlist you want is offered in this set and get your finger into position, it re-renders them with different content & different order.
The full playlist selection does the same thing, using some hybrid and opaque MFU / MRU algorithm -- I'd be delighted with a pure alphabetical ordering, rather than having to visually scan down an unsorted list that's re-ordering itself as I read.
Mind, the Spotify UI can be held up as a shining example for basically every user-hostile anti-pattern, so I guess there's some consistency in their design.