The bug occurs when a Turnitin assignment is hidden and then subsequently shown to students, which then breaks the connection between the Turnitin post date and the Moodle Grades ‘hidden until’ setting.
If you have previously hidden your Turnitin assignment and it is now shown to students, then edit the post date as this will synchronise with the Moodle Grades ‘hidden until’ setting.
Please note that students cannot view their feedback before the post date since this information is only held within the Turnitin Feedback Studio and not passed to Moodle. Feedback will only be revealed once the Turnitin post date has passed.
Turnitin have been made aware of this bug (case #00800490) and are working on a resolution.
For any help with get in touch the Learning Technology Support team.