I think I have found a bug.
This a screenshot of my table DB Tasks:
Then I created a view of that table and grouped by the column Projekte and Task:
Please have a look at Task 4 (marketed green) in the two pictures. Why is there in the table View of DB Tasks under the group Projekt 2 the task Task 4? There was never a task Task 4 assigned with Project 2 in the table DB Tasks.
I also deleted the groups from the View of DB Tasks table and still can’t see the third Task 4 which appears when I group the data:
Is this a bug or did I misunderstood something and it’s by purpose?