Graphs (line)- not showing timing correctly (X-Axis)

SSRS 2012

Hi guys

My dataset produce a column express as HH:mm:ss. So it means several rows by hours

The report is build up with a graph - Line.

Unfortunately, the Y axis (the horizontal axis showing timing) displays all the records correctly, but the X axis does not display each timing record (labeling).

Question:

how to show each record along the x-Axis (I tried to adjust the setting in the x-Axis properties without success) 

Thanks