FCCS Audit export file changes made by SYSTEM

Summary: What exactly the SYSTEM user is updating in the audit file export for Metadata Administration?

Content (please ensure you mask any confidential information): When running the audit report for User Group Metadata Administration the SYSTEM user is listed as making changes. The auditors are asking for an explanation of what exactly these changes are doing. Many (but not all) of the changes appear to be related to actual metadata changes that another user has made, so I am assuming it is "clean up" but I am not sure how to explain this to the auditors. Also, it doesn't look like it is happening every single month even though some metadata changes are being made every