A temporary patch for the bug that was stopping some people from submitting (a caching problem) also allowed a few non team captains to post submissions this afternoon. All submissions That has now been fixed, so from now on it should be the case that only logged in team captains see the submission box (and that they do see it!) All submissions for this round will be treated as valid so there is not a problem if someone else in your team submitted. Remember also that we consider all your submissions but only the best one counts.
Hope that clears things up.
Harry