By default the project state will be set to planning. In the planning state user are advised to change project state to committed before updating progress in the progress update panel.
You can check current project state from the info icon in the header or on the cards in the versions canvas.
How to switch project state
Navigate to the “More” menu in the header and click “Project State”
Select “Committed” from the dropdown then click "Save"
Note: Once the project state is changed to “Committed” the current plan and dates will be considered committed plan for future comparisons and reports