I do not see a clear difference between the four pictures besides the fact that the first two pictures are a different resolution than the last two pictures.
I would say that the problem cannot be shown with a screenshot if this is the worse screenshot you have.
Have you tried changing the look of your desktop?
Have you tried adjusting the settings of the monitor? There is usually a buttons at the bottom right corner of the monitor. One will be a menu button that will allow you to change the default settings or return the settings to default.