Problem with battlenet app - ad clips displayed twice on the monitor

I have a weird problem - when I open battlenet app, the little advertisement clips showed in the game tab are also showed outside the battlenet window on my desktop. How can I attach a screenshot to better illustrate it?
They are annoying, because they tend to pop up, when I using a browser or even playing a game.
So far, the workaround for me was that if I log out of battlenet, close the app, then open it and login, then this doesnt happen. If I simply close it and then open while logged in already, this happens. Any ideas how to make it go away, so that I didnt have to log in every single time?