It is entirely possible for a video to have more than one video stream, just as you can have more than one audio.
Each preferred stream type can be selected by the player.
So having dual streams is not an issue per se.
I did note that whilst one area of the player identified both 4K and 1080p streams being present, when playing, the skin (confluence in my case) identified both as being 4K but whether that has any relevance to an issue, I do not know.