It is different, I want to solve this problem
The bottom once you circled looks to me like it was not correctly UV unwrapped.
Maybe I’m wrong but. The first image is not a decal material? In my case if the decal material use a normal map, it turns to black if I place the decal correctly. In my case the solution was to rotate the decal by 180 degres, so the blue arrow need to look in the opposite direction. Sorry for my English. In the bottom image, I think the decal is to thick, change the thickness with the scale gizmo.