Youtube Sorting

Does anyone know how Apple TV sorts youtube videos from your subscriptions? I go to one of my subscriptions, and this is what I see:

old video (sometimes a year or older)
old video (also very old)
new video
new video
etc

I can't figure out why the old videos are at the top of the list. I've considered it might be view count, or rating, but there are other videos on these subscriptions that have a higher view count, and I don't think rating is it either, because the video's below the old ones, seem to be in chronological order.

I'd think they'd all be in chronological order so the newest videos are first.

Thanks.