Problem painting landscape material

I am having a problem painting 2 out of 5 of the materials in my landscape material. The two troublesome materials don’t render in certain quadrants of my landscape but they will in others. They turn the entire quadrant into the default checker pattern when they do not work.

Not sure if it’s the issue, but check the sample limit:

Setting all the texture sample nodes to wrapped worked perfectly. Thank you so much!

Glad You resolved it! Please consider to mark this topic as resolved.

Thanks! This helped me, as well.