How do I set up materials for landmass?

I’m still quite new to unreal and I’ve been trying to use landmass for a while now and I’m having issues figuring out how the paint layer targets work. I’ve set up a simple enough material that uses blending nodes for different textures and when I use for example the “Rock” texture in the Paint Layer Target it attempts to change the texture but for some reason it comes out as like a blend of the rock and grass texture(you can still see the grass texture). I’ve supplied some images to show you what I mean but basically this isn’t what I’m aiming for. I’m instead trying to get this to be a solid change.

I’ve also provided a screenshot of the material so far for reference.

The settings I’m using for the bending type is LB Weight blend if that helps and if I go in and manually paint the rock texture it seems to come out solid so I’m stumped as to what is going on.