Count decreases by increment amount and and last week's value cannot be calculated

[beynelmilel]

Hello, I tried to make a measure.
I am trying to find the target and actual measurements by counting the dates in a certain range as burn down.
But I miscalculated the realised column. actually I needed to make a calculation like in the red box. and I'm trying to max-realize using the realized data of the previous week, as in the area shown with the green lines.

"Red line area = max - release"

example data:

[lbendlin]

Please provide sanitized sample data that fully covers your issue.
https://community.powerbi.com/t5/Community-Blog/How-to-provide-sample-data-in-the-Power-BI-Forum/ba-...
Please show the expected outcome based on the sample data you provided.

https://community.powerbi.com/t5/Desktop/How-to-Get-Your-Question-Answered-Quickly/m-p/1447523