This is unintended and not very useful. The filtered-by-project charts show the right value (cumulative open tasks, i.e. open minus close). Change the value to aggregate creation events and status change events.
- Maniphest Tasks
- T13279: Build Charting for Facts
- rP9d8cdce8e1f2: Make the top-level burndown chart in "Maniphest > Reports" show open tasks, not…
Viewed top-level chart, saw the value no longer monotonically increasing.