Chart horizontal axis with all zeroes values error

Hello,

I have this data set:

Series 'Value field' is depth, 'Category field' is concentration.

Even though all Concentration values are zeroes, chart draws them with 1,2,3,4,5 values. Chart module creates 1,2,3,4,5 values for the horizontal axis, even though they are not in the data set. Chart look like this :

I tried to assign min and max values for horizontal axis (0 to 10). It still did the same; created points that are not in data set. Chart looks like this:

Can someone please help to understand why this happens? Is this a bug, or there is way to handle this type of situation?

Thank you