[VR] Why do my materials look different ingame ?

I had a Vr scene that was working correctly. Today I imported VFX packages, and I don’t know what I have done but now my scene behaves strangely.
Here is a picture of my scene :

However here is what I see in my Oculus :

Plane and Cube’s materials are set on Standart.

Problem resolved, just had to get the materials on Sprite->Default.