Gantt cannot plot time in y axis and not listing all legends

Thanks, i am seeing couple of issue. Could you please help me here to resolve the issue.

1.The workflow is starting at 2:30 PM and ending at 3:30 PM. But it doesn’t show correct start and ending point in Y axis.
2.The workflow 5 and 6 are same start and end time. And it not differentiating and it is overlapping.

Thanks