Report / Dashboard - Grouping option not working


I added a grouping in a report to organize the display in a dashboard. I want to group the report by type of project and for each type of project sort by go live date.

When I am in the report, the grouping works. However when I pull the report in a dashboard, the grouping is not taken into account, only the sort by go live date. I tried to use the sort option but type of project option is not available. I tried to select the report again in the dashboard, still not working.

Any idea what is going on and how to solve / workaround this issue?