tl;dr: contestant submitted 23 entries to a contest, rules state you have to select one for official calculation of your score, contestant changed his mind a few times and ultimately selected an entry that did not have enough points to win despite having another entry that did have enough points.
--
In reading Anthony response, this seems less about a "bug" but more about you not being happy with the results and blaming the complexity of the submission and selection process.
This part of his response seems fairly clear:
"The submission page stated: “Note: You can select up to 1 submission that will be used to calculate your final leaderboard score. If you do not select them, up to 1 entry will be chosen for you based on your most recent submissions. Your final score will not be based on the same exact subset data as the public leaderboard, but rather a different private data subset of your full submission. Your public score is only a rough indication of what your final score might be. You should choose an entry that will most likely be best overall, and not necessarily just on the public subset.”
During the course of the competition, you made 23 submissions of which 3 were selected for leaderboard scoring. First you selected submission 242748 on January 7, 2013 (all times UTC). You unselected that submission on January 24, 2013 and selected submission 250852. You unselected that submission on January 26, 2013 and selected submission 252143. You did not revise that selection at the time of your final submission. It seems logical to conclude that you understood the process of selecting submissions.
Three of the other winners selected their final submission for scoring. The two that did not select the final submission had not previously made a manual selection or had unchecked prior submissions and the software worked as designed and selected the final submission. One participant (but not a winner) made 3 final submissions and selected one for scoring - which was the case the software for selecting a response was intended to handle. There was no bug in the software. "
While unfortunate for you, it is worth noting that all of the competitors had to follow the same set of submission guidelines to be considered.
Your response becomes a debate on how you “feel” the submission process should work, as opposed to indicating a “bug” in the software.
“What on earth is a checkbox doing on the submission screen of a two phase competition? There is no ambiguity - there is only a single file type that is valid for the final leaderboard file. Why on earth is your software not smart enough to figure that out?
Also - why didn't the default selection logic kick in? Because only final leaderboard files are valid for the final submission, why didn't your software pick the only valid option?”