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Hey there, stevebrowne60!
Transactions, including invoices, deleted and created by the System Administration are related to their sources. I'd be glad to share further information about this.
QuickBooks Online (QBO) tags transactions as created by the "System Administration" if these transactions are:
Also, QBO tags them done by the "System Administration" if you've deleted or undone those invoices from a synced third-party app.
You can also refer to this article for more details: View Audit Logs in QuickBooks Online.
I recommend reviewing those transactions from your end, and let me know if there's anything else that I can help you with.