Hello there, @andy-jt53-gmail-. 

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

You'll make sure you choose the correct bank account when recording a deposit in QuickBooks. Also, the Incorrect Statement date is one of the reasons why the transactions won't reflect when reconciling it or when the transaction is marked as reconciled on the register. You can try to delete the payment and record the bank, then deposit it again. 

I’ve also added this article that you can use for future guidance in effectively reconciling your accounts in QBDT: Reconcile an account in QuickBooks Desktop.

You can 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. 

Lastly, here's an article you can read to learn more about reconciliation: Reconcile accounts in QuickBooks for Mac.

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!