some transactions still exist after

I'm glad to see you here posting and welcome to QuickBooks Community, @marvberg. I'll provide steps to ensure that you're properly reconciling and make sure that your account stays accurate. 

You'll need to investigate if these transactions are valid or not. It's best to check these transactions with the bank statement from the previous periods. Transactions that have been reconciled and cleared appear to be uncleared. A future date entered in the Statement Date field of the Begin Reconciliation box causes this to happen.

As transactions are cleared in QuickBooks Desktop, the Statement Date (future or otherwise) is assigned to each transaction. Cleared transactions with a future date assigned may appear in the Uncleared Transactions section of a reconciliation report when it is run.

To help prevent this issue in the future, check the date in the Statement Date field of the Begin Reconciliation window before continuing with the reconciliation. Make sure the date does not occur in the future. You can undo the previous reconciliation and then reconcile the transactions again using the correct date. 

Here's how: 

1. From the Banking menu, select Reconcile.
2. In the Begin Reconciliation window, select the appropriate account, then select Undo Last Reconciliation.
3. A message to back up the company file before undoing a previous reconciliation is displayed. If you have already created a backup, select Continue.
4. Select Ok when the message Undo Previous Reconciliation has completed displays. Note that the last reconciled on date has reverted to the previous date.
5. Reconcile the transactions again.

Once done, Leave the reconciliation as it is. The transactions will appear as cleared on the report once the statement date has been reached. Also, I'd recommend reaching out to your accountant to help you correct the prior year's transaction accounting. 

Please refer to this article to see information on how to fix the issue once your accounts in QuickBooks Desktop don't match your bank statements at the end of reconciliation: 

• Fix issues when you're reconciling in QuickBooks Desktop. 
• Resolve common issues on the Previous Reconciliation report. 

Please let me know in the comment section below if you still have a concern about reconciliation. I'll be waiting for your response and will be always happy to lend a helping hand. Tale care!