My students started a course today. The course is set up by sections. With each section being available every 7 days. However, today, they are able to access all the sections instead of just the first one. I've attached a screenshot of my settings. I also have the date and time added to each unit when it is available. I never use to have such a problem with this, I don't know what has changed but lately, it has become quite confusing. Your help is appreciated.
https://drive.google.com/file/d/0B3AVnT09XUJdRWtPNEZDMUVkclk/view?usp=sharing