strange artifacts introduced by Spot Healing Brush
I am experiencing strange behavior by the Spot Healing Brush. I am on a Layer I created above my main image Layer which I have turned into a Smart Object. I am using the Spot Healing Brush there with Sample All Layers selected, to build out the tile border on the left side. This is working but strange artifacts are also being introduced, as can be seen in the screenshot where there is a whitish rectangular shape resting inside the frame of the image and slightly overlapping the white tile, mainly on the vertical and to a less extent on the horizontal. I notice when I paint with the Spot Healing Brush that it is not a dark grayish color when I initially paint before it paints in the content, but whitish, with shapes and gridlike patterns interspersed. Does anyone know what could be happening? Thanks.

