For some sets of tasks, scheduling is so bad as to render the gantt chart useless.
The problem might be related to short tasks.
- A listing of a small set of inter-related tasks
- A JPeg of the Gantt chart produced (7 hours per day) showing most tasks being assigned start dates before those of the tasks blocking them. Inter-task relationships are shown, but have no effect on scheduling.
- A JPeg of the Gantt chart produced for 1 hour per day (and removing all start dates), showing a reasonable flow of tasks given the relative task sizes and the actual blocking/blocked-by relationships. But, of course, the timescale is nonsense, and I can see no reason for the huge delay between the finish of 71 and the start of 72.