How do I correct the Starting/Prior Balance when I do a reconcile?

I thought I had done a Reconcile for February. When I started a reconcile for March with Quicken 17 for Mac using the “Use Statement Balance” the amount in the starting balance was the balance for the end of January indicating I had not reconciled February, however the items from the February statement in the ledger for February indicated that I had marked them as cleared indicating I had done a Reconcile for February. Won’t that mess up my reconciliation? How do I correct that?