Thanks for reaching out to the Community, @concordchris.
Making changes to your transactions that have been reconciled can affect your starting balance in QuickBooks. To verify if there are modified transactions, you can check it in the Audit Trail in QuickBooks.
Let me share with you how.
- Go to Repots.
- On the drop-down, select Accountant and Taxes.
- Click Audit Trail.
If the issue persists, you can verify rebuild data to check if there is a behavioral problem with the file due to power interruption or accidentally closed QuickBooks.
For your future reference, you can read this article on how to find reconciliation discrepancies: Find reconciliation discrepancies (MAC).
Please reach out again if you have any other questions. Have a great day!