How to paint terrain with more accuracy?

hi! It’s me again, still begging for some much needed help. :stuck_out_tongue: For some reason I can only paint in straight/diagonal lines, which makes my roads seem very rigid. It looks like the material is snapping to grids or something. Is there a way to paint freely, so that I can create nice curvy roads?

As you can see I can’t paint outside that road, if I do so it creates a big pixel/cell, it makes it impossible for me to create something precise and curvy.