Wrong sorting of tasks

Hello,

My tasks are categorized by priority, then sorted by date. In the "high" priority group, the tasks are correctly classified: the closest deadlines are located at the top. Tasks without deadlines are located at the bottom of the group.

The problem is that in the next groups, i.e. in the "medium" priority group and in the "low" priority group, the tasks without deadlines are at the top. The tasks with deadlines are located at the bottom. It should be noted, however, that the tasks with the closest deadline are well positioned above the tasks with the furthest deadline.