Thanks for getting back to us, @GAL.
The possible causes of beginning balance issues could be someone edited, deleted, moved, unreconciled a transaction, or manually reconciled a transaction. It won't show up for review and can't be added to future reconciliations.
I'm here to help fix your beginning balance in QuickBooks Online.
To begin, make sure your opening balance is correct. If it’s incorrect, it affects all of your reconciliations.
Then, check your bank statement to make sure you're reconciling the right account.
- Go to the Accounting menu.
- Select Reconcile.
- Review the account you selected in the Account drop-down menu.
After that, match and categorize all of your downloaded transactions before you start reconciling. Leaving any unreviewed will affect your opening balance.
Once your opening balance is correct, you can start reconciling again.
For the transactions that you already deleted, it won't affect the next reconciliation.
You can also check out these articles for more detailed information:
Also, you may want to consider setting and using banking rules for downloaded transactions to automatically categorize transactions from your bank.
If you have further questions in reconciling accounts, please feel free to reach back out. I'm always here to help.