Strange colours in group on bar char

[luca87]

Hi,

I have 1 database and, on this, I created 2 bar char with two different slider filters on date. In this image the color of states is the same.

(this configuration of fill )

if I change the slider, as you can see the state colours have changed:

I expected them to be the same.

What can I do to be equal?

Thanks,

Luca