You are managing a 12-month infrastructure project using a predictive approach. At the end of month 4, you review the project dashboard and notice that planned value (PV) is $400,000, earned value (EV) is $350,000, and actual cost (AC) is $380,000. Several team members report that they have been working on activities that were not originally scheduled for this period because they had available time. What is the PRIMARY issue this situation reveals about project management processes?