Steps to recreate:
1. Not in a policy, create a backup job (Job 1).
2. Create a duplication job for that job (Duplicate Job 1) (it is now linked to the job your created)
3. Now on the backup (Job 1), right click and 'Copy'
4. You now have a job called Job 1(2).
First issue is if you run 'Job 1(2)', when it completes, 'Duplicate Job 1' job runs and duplicates the data from 'Job 1(2)'. I didn't create a duplication job for 'Job 1(2)', it is still linked somehow.
Second issue, the worst, when you delete 'Job 1(2)',it deletes 'Duplicate Job 1'.
Anywhere I can log this, or is here fine.