Blended different data

Hello,

I have two different result with the same blended :

As you can see i have a result with :

50.61 ( is the good answer ) → with no dimensions in blended and the cross join

51.17 (not the correct answer) → with the dimension date on blended

but if i want to have a time chart serie i have to add the dimension date in the blended.

do you know how can make to have the right result with the dimension date.