Why aren't these sprites rendered according to my z-index?

All my sprites are in the Default Layer.
These sprites have different values for each z-axis.
But I had a problem, when my camera went to the right, the rendering order changed, and then I went back and the rendering order was different.


PLEASE CLICK LOOK preview picture.
https://s1.ax1x.com/2020/03/14/8QgX8O.gif


I wonder what causes such problems?
Is there a quick and easy way?

 

How different are the z's? Maybe it's perspective camera with very small z's?
Does orthographic solve it? This isn't a solution b/c you'd lose the parallax effect but that would tell us more info.
If you use different sorting layers / sorting orders, does the same problem persist?

 

When I set Order in Layer, the rendering Order was fine, but it was a lot of work because I had a lot of sprites.

 

Actually, what I want to do is simple. Enables the camera to render sprites in z-index order.

 

What happens if you try to set a Custom Transparency Sort Axis so that it uses front-back according to z? This setting can be accessed through Edit > Project Settings > Graphics.

 

Thank you very much!!! YOU HELP ME SOLVE THIS PROBLEM!
This knowledge point is rarely mentioned in Unity tutorial videos.

I use LWRP in my project. So I found the setting in here.

 

Yeah, that's a real "gotcha" feature: not very widely known about. Cheers!