Hi Carla

Apologies for the late answer - I have been on a long break.

The use separate completion data means that the activity is not being completed through the criteria that is required to complete the activity but having its completion manually set.

For example if the quiz activity has a completion criteria of grade > 50 then if this setting is used then the activity ignores the grade and completes based on the completion status manually set.

If you need to adjust a quiz grading then this should be done through the grade book and manually overriding the grade to achieve the pass rather than using the course completion editor and 'use separate completion data'

To fix this the completion editor needs the use separate completion data changed for the individuals this applies to. Unfortunately the completion editor only shows one record at a time so would be very time consuming to change manually. I can't think of an automated way to do this so suspect a script needs to be created to change the setting..

Are you or your partner able to create a ticket detailing the activity completion criteria and what records you are requiring to be changed

regards