Duplicate checks

Good day, @Richardrobo,

Writing a check in QuickBooks Desktop is a form to record money out into a petty cash account or pay credit card dues.

You can either void or delete one of the written checks to avoid duplication.

Here's how to void or delete a check:

1. Go to the Banking menu.
2. Select Use Register.
3. Choose the account you used to write the check from the drop-down.
4. Locate the check.
5. Click Edit Transaction. 
6. Click Delete Check or Void. 
7. Confirm the process by clicking OK.

Please check out to this for more details: Create, modify, and print checks.

I've also added this article to help you when reconciling your bank accounts: Reconcile bank and credit card accounts.

Should you need further assistance reconciling your bank, don't hesitate to leave a comment below. I'm always glad to help.