Starting balance off

[Fuchs Ira]

I reconciled my checking account last month and now when I go to reconcile the account for this month, the starting balance differs from the ending balance of the previous month by $.30. How is this possible? Given this discrepancy, I can no longer reconcile the account unless I enter a fictitious transaction (or change a reconciled transaction) to make it balance, obviously not a good idea.  I double-checked all of the reconciled transactions from the previous month to make sure that nothing had changed after the reconciliation and they are correct. I just don't understand how the starting balance can differ from the previous month's reconciled ending balance.

Thanks for any help you can provide.