Q:

SSRS line chart.  How to stop numbers from repeating in vertical axis

I have a line chart in ssrs.  Whenever the highest line values are 1 or 2 instead of getting a scale of 0,1,2 which is what I want, I get 0,1,1,2,2.  This dosn't make sense especially because the number values are not decimals and are unformatted. 
Please help. 

A:

The Expression for the vertical axis Interval should be below expressions. 
If your value is sum
=IIF(Max(Sum(Fields!Item. Value))<20,1,"Auto")
If your value is count
=IIF(Max(Count(Fields!Item. Value))<20,1,"Auto")
Note: I used 20 as the above that the Auto will work good.  Make according to your requirement.