Different results depending on dax in measure vs. same dax in variable

[KrisD]

Hi!

I am scratching my head with this one, and am obviously missing something. Seems to be some calculation difference between a variable and a measure reference?

I have two measures intended to display a cumulative average month by month, one of the measures has a variable with some calculation in it. This measure displays the wrong result. 

If I however put the same piece of code in a separate measure and reference that measure instead of having it in a variable, it displays the correct result. 

What is causing the same piece of code to render different results depending on it being in a measure vs. a variable. Pictures below. 

Below is the code which is used in the two other measures following further down: 

This gets me the average number of tickets per year-month:

These two measures below are using the above code in two different ways:

So as you can see the code in the first picture is being used both as a variable and as a measure reference in a calculate statement. 

Why am I getting different results with the same code?

[mahoneypat · Accepted solution]

When calculated as a variable first it is in the evaluation context of the visual.  Putting the variable inside the CALCULATE(variable, FILTER(...  does not recalculate the expression in the desired new evaluation context.

Pat