Landscape layer painting issue, layers don't blend

Hello,
I need a little bit of help with landscape materials. I have a blended landscape material that works in one level, but exact same material doesn’t blend in the new level of the same project. My brush settings are the same, but whenever I paint on the ground at a new level, it appears as though the new paint layer is either painting in squares or like blotches and doesn’t blend with any other layer as shown in the image below. On the left, those layers don’t blend and there is an odd blurry artifact around layers but on the right, everything is coming together smoothly. Does anyone know what’s causing this (left image) and how to resolve it? Thank you!