When trying to use a soft brush to do light shading on photos, I get a build up of rings. I've tried messing with the spacing, flow, and other brush settings, but nothing changes. I've googled everything I can think to google, but can't find any info on this particular problem. The picture included shows what happens when you overlap the same brush stroke repeatedly; I simply clicked in the same spot multiple times with a low opacity brush. So, when I'm shading an area on a photo and I overlap brush strokes, it causes ripples or what looks like banding. Photos are in 16 bit as well. Any help is greatly appreciated.