Overview:
Unexpected value logged into the Vault System Audit History.
Root Cause:
A user makes a change affecting another user in a different vault within the domain.
Solution:
A Vault domain can contain more than one Vault. A user, with Domain Admin permission, makes a change that affects another user in a different vault within the same Domain. The System Audit History shows the change is made by the System user.
Related Documentation:
Vault Users & Groups Documentation: Managing Users Across Vaults
Thank you