Cel Shading Issue : Shadows moving with the player

Hello everyone !
First time here, I will try to make it right.

I am currently trying to make a cel shading post-process material and it’s my very first time doing that kind of things (I am a huge beginner in shaders). But I have a weird issue, the post processing is close to satisfying me, but I have a weird casting of shadows when I move my character.
It seems to have a cone of light with a constant direction (minus X), and that cone of light is following my viewport.
It makes the light in the level totally unnatural (because usually in the real world the shadow in a room don’t move with me).

Here some screenshots of the cone moving with me (I am in editor in the screen but it’s also true when simulating) :


And one to show you the fact that the direction of the cone don’t move.

My post process material looks like that :

If anyone here know what it is and how to get rid of it please tell me !

For now I assume the issue come from the directional light, but even after playing with the parameter of that last one, the cone’s still visible.

Up please !