ok, back to this problem again

Our contests run Mon-Sun. On Friday, I have been marking the contest category that all user groups can view, post comments but not upload the rest of the week until I open it again on Monday. Only user group I allow is the admin group which is only my husband and I. It seemed to work the past 2 weeks only because I saw uploads to the contest stop on Friday nights. But today (Sunday) just saw someone able to upload a new photo for the contest. How is this happening when all user groups are set in PP admin user group area to not be able to upload?