Condition Monitor Collection Rule

We have established a Collection Rule that depends on the Number of Days and Amount to determine the action, allong with a Template that also is keyed off Days and amount.  We have turned on Business Unit Monitoring to help reduce the amount of actions returned.  When I ran the Condition Monitor for a subset of Customers based on the Customer Group, I received output on ACTION_LIST for all of the Customers in the Group, and an additoinal Customer.  The output was inconsistent, meaning for one Customer it was the Oldest Item(s) if they had teh same Due Date, but