Hi TK223,
Welcome to the Community!
If this is not your first time reconciling the bank account and a change has been made to a reconciled period, you'll have to undo the previous reconciliation or manually reconcile those transaction that changed. Any changes made to a reconciled transaction will affect your beginning balance to be off for your current reconciliation.
Furthermore, a transaction does not show in the bank reconciliation if it has been reconciled or it could be deleted or was not added or downloaded in QuickBooks Online.
You can run a reconciliation report to view past reconciliations. Here's how:
- Click on the Accounting tab, and then click on Reconcile.
- Click on History by account.
- Click on the drop down menu and choose the account and date range.
To learn more about bank reconciliation in QuickBooks Online, please check this link:
Fix issues for accounts you've reconciled in the past in QuickBooks Online
Comment below if you have questions. I'll be sure to get to you right away.
