The 'Projected Cost for Month' is calculated via the following formula:
Projected Cost for Month = Total_MTD_cost + (Remaining_Hours_in_Month * (Total_MTD_Cost / Total_MTD_Hours))
This results in the 'Projected Cost for Month' is zero whenever the 'Total_MTD_cost' is zero.
The reason the Total_MTD_cost is zero is often because the instance was launched recently and it has not incurred any costs. This can be validated by verifying the 'Launch Date' column in the assets report.