When using 2.1's x2 tool to clone Turnitin activities, if there are any submissions already in the assignment it duplicates them as well. It then "forks" the two clones so that any new assignments in the duplicated inbox only go to the duplicate.

Furthermore, the gradebook lists two Turnitin activities of the same name, even though you might have changed the name during the "edit" phase of the duplication. Editing the title or summary of the activity after duplication still doesn't change the identical cloned title it has in the gradebook, making it very difficult to keep track of which activity is which.

If there is no way to duplicate Turnitin activities seamlessly, it might be best to disable duplication for them.