Make sure the nodes you use to create the height map and ultimately your normal map are set to 16bits (the link between these nodes will appear thicker once set to 16bits). You can set the first nodes/noises you use to 16bits and the following nodes should inherit de setting.
I have this problem where a terracing type of effect is happening. I am trying to create a snow material and their are different levels undulation and bumps. I tried diagnosing it by going node to node but I can't find one that is causing it. I also tried just doing an overall blur to the height map but that didn't make a…
I was playing with it more yesterday and what I did was disconnect all the nodes and reconnect them and that solved the problem. I have switched it to 16 bit today too. Thanks @Jerc!