The Projected Monthly Cost measure does not match when looking with a Daily interval selected. Cost for the previous month is in line with the daily cost measure, but is inflated for the current month:
This is working as designed for policy purposes.
For the current month, the platform displays the projected value for the entire month. However, for closed months, actual cost is shown. Since daily granularity is available in the policy engine, it allows checking the projected cost for the month in a daily policy.