Question Looks like a resolution problem (between build and editor)

Hi there, I really do not know where to start my debugging journey here.
I have a render texture let's say 500X500. for each block of the game, the code add a pixel (value between white and black).
How could it be possible that the pixel on the build are twice bigger? Here it seems certain that the render texture has not been scaled up on the build because the block light (black-white pixels) are still at the right place.
Could it be a render texture resolution thing.. if so where can I change theses settings?
Thanks!

 

Just fixed, not sure how I did it. Went in Player settings/ quality, disabled low quality now the build is on best quality, I suppose that has impacted the render texture resolution or something... fixed