Why is the time axe not linear and uniform ?

 

prices ~ time graphes are not arawed in un-linear and un-uniform . This happens in all graphes!! So also when graphes drawing in other sacle mode.

What is wrong?

plear check the three bars in graph, their time mark is 2013.09.24 04:50;04:45;04:30; not in 5 minutes intercal !

And pleace check the labels on time Axes, they are 03:15;03:35;03:55;04:15;04:45;05:05;05:25;05:35.

one interval is 30 minutes and the another is 20,

and should be 15 minutes or same for all intervals since alwys there are three bars drawing in one grid interval !

 
If there is no tick between some time, there is no bar. On other words, bar with 0 tick aren't drawn.
Reason: