@katie82 ,
You may need to use the Transaction Detail by Account instead, to sift modification activity to the top, and determine if any accounts have had several recent edits to old transactions.
1. Reports > Transaction Detail by Account
2. Choose appropriate Report period.
3. Click Customize, click Change columns.
4. Tick Create Date, Created By, Last Modified and Last Modified By.
5. Reorder columns (click and drag nine-dot grid) to put those four columns right after Date.
6. Sort by Last Modified, toggle Descending.
7. Save customization so it'll be there for next time.