when i went to submit earlier, the guard at the counter chatted with me for a while, and he did mention that a lot of people didn't follow instructions, something like, never mount even, and they had to turn away a lot of submissions.
from what i heard, on the final day, there were more people submitting, so they possibly had no chance to reject wrongly done up entries
in any case, you can collect back your entries from my understanding, so no harm done. you can always bring the prints home for your own personal use, and there was no entry fee.
it is easy to point finger at organiser, but i think, most of the time, people don't bother to clarify. anyways, i did see some random entries on the internet when browsing.. some of them submitted photos that do not match the themes they were submitted under even loosely.....