Buged mesh render

Hi!
I have a bunch of simple entities that their purpose is to render background images.
They are something like this:
Transalation component
RenderMesh component->
-mesh = quad mesh
-material = a unlit transparent material.

I have an orthographic camera and I positioned those entities to be partially overlaping with each other.
I want to sort some entities to be on top of another. To sort them I use the z axis; the entity on top have a lower value on the z axis.

What happens is that the render don't respect the z axis sort.

Anybody knows why this is happening?