This could be uploader error
Iv'e done it myself without double-checking before hitting upload lol
Due to "movies" and "Mobile" being next to each other in the drop-down selection list....it's quite easy to select "MOVIE" for your upload...then you try to scroll down to fill out the description box with the arrows on a lap-top and it doesn't until you click on an empty space first...
But instead it selects the next available option down on the still active selection list....which is "mobile"....this is prolly why you got a few movies in the mobile section as iv'e done it myself
Hope this explains the mystery