I check Manage users and cannot see system administration user. but it seems a user system administration is making changes to my system. Need help?

Hi there, Philemon. The System Administration you are seeing is one of the users created by QuickBooks. It's not an actual user account, and it shows changes made automatically by QuickBooks Online.

I've listed several reasons why this happens:

• When you change a record, it can affect another one. For example, if you edit a payment and link it to a different invoice, you'll see a System Administration event for the original invoice.
• If you connect a third-party app to QuickBooks, any data it sends or changes it makes will also show up as a System Administration event.
• You create a recurring transaction, such as a recurring expense. 
• You set up other events to happen automatically, even when you're not signed in. For example, a System Administration event may appear when there's an update to your bank feeds.

Feel free to view this article to learn more about users created by QuickBooks and their purpose: Use the audit log in QuickBooks Online.

Let us know in the comments below if you have any other questions.