Sorting just by the created date won't give you the order I intended. There are 7 levels denoted by tags - dif1, dif2, and so on. You should sort all the first level cards by created date, reposition them to start at 1000, then sort all the second level cards and reposition them to start at 2000, and so on for all 7 levels. If you don't do that you'll get cards from different levels mixed together.
I would still like to know what your problem was in order to make sure that there's no problem with the deck itself. I study with the deck myself but I always have to reschedule and reposition all the cards before I share the deck so it's possible that there may be a problem with the deck.