Landscape Painting looks blocky

If the landscape resolution is the case, as so many users are trying to convince these people is the actual issue. Then please explain to me why i just had a landscape where the painting was smooth as butter, and then when I created a new Material for the exact same landscape this problem arose? I’m Really asking, It cant be landscape resolution, I literally used the exact same landscape with two difrent materials and one material was smooth and the other was pixelated…

Please Help