Unable to landscape paint, depending on which layer I fill first

Hi Guys,

I’m following Chris Murphy’s tutorial on Udemy and came across an issue. I am attaching a link to the issue on youtube so you can see it, because the problem varies and I can’t describe it. But basically, at times I can only paint one layer, or fill one layer,. the dirt layer if I fill it, it is fine. if I paint it, I get a blend of grass that I don’t want. I’m expecting that when I paint dirt and grass separately, they should be blending at the falloff point.

Here is a link to the video:

Here is the landscape material:

Here is my grass function:

Here is my dirt function:

And the layer blend settings:

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