Allign grid with Splatmap

Hi,

I am trying to get a grid to align with the splat map, since I want to be able to control which cells need to be painted. I have a grid-based game where the player can lay down road and the cells he has chosen will be painted. I got it to work like 90% as shown in the picture. At the center of the grid, it actually paints in the middle of the grid cell. And to the left and right and top and bottom from the middle, it also paints in the center. When moving from the middle and to the corners it starts to get skewed and I have no idea why?

The Terrain width and length is 32 x 32.
Control Texture Resolution is 32 x 32
Base Texture Resolution is 32 x 32
And of course the GameGrid is also 32 x 32 the number of green boxes