Hi Carla

thanks for confirming that the recover grades option was used. - note that if the user is unenrolled and they were enrolled using audience sync method then reenrolling them will not recover their grades. There is a warning when taking a user out of the audience that the user may lose their grades.

If this is not the behaviour you want then there is a setting for the Audience sync for what happens when the user is unenrolled - if you choose 'Disable course enrolment and remove roles' the activity grades are retained .
Select Site admin > Enrolments > Audience sync > External unenrol action to change this.

regards