@Emote OK, S.A team had a look into this and it works fine but you need to delete your previous version and upload the new one, it should work then. My previous reply @Schwartz might have been confusing, sorry, corrected now.
Just a reminder here, the vote here on the remix-comp page is just for fun and for remixes appreciation between competitors. Though it's already great to have your remix sitting at the first place, remember that this has absolutely no influence on the final decision when picking up the 3 winners, this is done by artist/label.
Let me know if deleting your previous mix and uploading the new version did work.