Q:      Why is my opening balance amount different this month on my reconciliation before I start? 

A:       If your previous month's reconciliation included an adjustment, your opening balance will automatically be adjusted to take this into account.   If Actionstep did not adjust the opening balance of the new reconciliation by the amount of the previous adjustments, then the transactions that those adjustments were for (which you will mark as reconciled this month as they would now potentially appear on your statement) would mean you could not reconcile this reconciliation. 

This article explains this in more detail How Adjustments affect your next Trust Bank Reconciliation