That’s the occlusion, and it’s normal behavior. Unlike edge wear, occlusion depends on all the visible objects and it’s not limited to a single object. In the following example there is a hidden cuboid (still visible in render) that removes edge wear and adds dirt with the default settings
Try applying grungit in an emptry scene, or temporarily disable the plane’s render visibility, or if you don’t want occlusion you could set it to 0 from the node itself, but I don’t recommend it if you want to add AO dirt.
I agree, maybe I should reduce the default to something like 0.5, and also reduce the grunge and cracks and increase the global control accordingly.
You can try decreasing grunge and increasing global control
Try decreasing the size of the scratch texture, they will appear thicker, but also sometimes longer and you might need to reduce the scratch amount
Agreed, I will try and find some time to do that