I understand your confusion. Allow me to explain what's going on here: once an app launches, the app has control over the picture settings; sometimes apps will allow users to control these settings by pressing the Tools button on the remote. I hope that helps explain this.
I have the Samsung un32es6500fxza and for whatever reason, despite me calibrating the picture settings, whenever I start a Smart TV app like HBO Go, the picture settings will default back to the settings I got it with which makes the HBO Go series such as Game of Thrones look awful as opposed to how nice it would look had it not reset the settings.
Why is it resetting all my picture settings? It seems to happen right when I enter HBO Go, not when I click the button to enter Smart Hub.
All help is greatly appreciated and will be answered quickly, thanks!