Quick Selection tool not behaving itself in Photoshop CC 2017
I have been trying to replace boring skies with a layer of clouds, etc.
The background layer is of plain but bright blue sky. There is a horizon that is sharp and multicolored. There is a clear color distinction between the blue sky and the horizon.
Yet the quick selection tool is not able to be dragged along that well demarcated horizon. It jumps into the city and will not "find" the pixel border between the different elements.
Other than resetting my tools is there something else going on?
The two images are jpeg.
Thanks

