Level editor paint tool issue, all materials have tint of first material

I stated the issue in the tittle but I can't seem to find a fix.

 

let me explain better, let's say my first material on the list of materials I can paint is grass, Now I paint a different material such as rock, the rock would have the tint of the diffuse from the first material even if I delete the diffuse of the first material it sets to the last know diffuse.

 

Which map is your map based on, or did you make the ground materials yourself? Some maps use the same diffuse texture for all materials, so they may not be very compatible with editing in game.

Not sure if that's the issue. A picture would help.