this is Display bug !
if you see on the picture the Value that i point when X = 17:43:31 Y = 1 it display the correct value on the pointing ,but axis Y on the chart holds incorrect value
you can also see that the separation line ticks holds the value 0,1,3,4,6 this division is INCORRECT display ,it should be 0,2,4,6 or 0,1,2,3,4,5 .