I have added new units to a class but for students that have already begun the class, the new units do not display.
I tested it with new students and they don't see the new unit either.
This works fine at our end, please make sure the theme and plugins are updated to latest versions.
If the issue persists then please share the site url and the admin credentials with us to check the issue on your website.
Please make sure you mark your reply as private while sharing the credentials.
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I checked your website and found out that your theme is still at 2.3 version but the plugins are at 2.5 versions. This can cause issues on your website
Please update your theme and plugins to latest versions i.e. 2.5.1