In my Quicken Classic Deluxe (on a Windows 10 system) the Prior Balance in the Reconcile Details window does not match that of the Ending Balance of the previous month although that month was reconciled without issue. What's more, the Cleared Balance box in the Reconcile window shows a balance before I have marked any line item as "Cleared".
I'm sure I have made a mistake somewhere, but I don't know how, and I don't know how to proceed.