Problem with landscape painting

Hello, I just started learning Unreal Engine and I’m having a problem with landscape painting.

I downloaded a Megascans landscape asset and tried to add another layer with a material that I want to paint on it. I followed a couple of tutorials and added textures to the parent material of the downloaded asset.

I noticed that two layers were added in Landscape Mode.

Now when I paint the landscape using the Add layer, I can see it painting, but the color is different. Also, when I paint a small area on the ground, the surrounding area changes color as well, you can see this in the screenshot below.