We have not received similar reports about statements that are attached to the wrong reconciliation, @gigportal.
In the meantime, I recommend removing the incorrect PDF attached to the most recent reconciliation and attaching it again to the correct one.
Here's how to remove the attachment:
- From the left menu, hover your mouse over More and choose Accounting.
- Select Reconcile.
- Click on the attachment you want to remove.
- Hit the Trash bin icon.

You might want to explore working with QuickBooks Live Expert Assisted services. They can offer guidance in attaching statement to reconciliation within QuickBooks Online.
Don't hesitate to comment below if you need further assistance in attaching statements to reconciliation.