Allow me to provide additional info on what @James_MasterofBooksthatareQuick mentioned above.
You can open the invoice in question, and open its Audit history page. Be advised, you need to log in as a user with full access rights to view this page.
Further details of this process can be found in this article: How to view transaction changes in the audit history.
On this same topic, you can also take a look at this article: Use the audit log in QuickBooks Online. This page tracks the changes in your books, as well as who made them, and when.
Have other questions in mind? Drop them in the comments below, and I'll get back to you.