I didn't sort them by date, but I will think about adding that feature - if two users submit an image from the same experiment, the earlier one will have higher weight. An earlier submission on the same experiment won't necessarily be a winner. In your case, you were not selected as a winner because you didn't resteem the post. You can participate in this contest with up to 5 entries. Make sure to resteem if you want to qualify for the prize payouts. Sorry for the misunderstanding. Thanks!