Post Process Volume values changes when clicking Play without apparent reason

Hi

I added a post process volume on my Scene. Here are some values of it:

My scene looks like:

But when I hit Play, these are the new values of the Post Processing:

and my Scene looks like:

Now I simply activate min and max ev100 tickboxes manually at runtime:

And these are not the only values that are changing? Why happens this and how can I avoid it?

As I have read in other posts, I have checked that the pp volume is enabled and unbound both in editor and play mode.

I have checked too that the camera post process is not overriding the pp volume, because I have set the bloom from camera pp to 10 and, when clicking Play, this is not the bloom value that shows.

I have another pp volume on scene, but this one is NOT unbound and its priority is set to 0, while the pp volume that I am speaking about, which is unbound, and, as showing in the image above, its priority is set to 1.