Hello AntoineJones,
How are you minimizing your game?
What I believe is happening is even though your game is minimized, it is still acting like it is in full screen mode. It really is nothing to worry about.
When the game is minimized, try holding ALT + TAB to bring up the program switching window. Switch to another running program by pressing tab until the program you want is highlighted, then try doing stuff on your desktop. If no other program is listed, just try hitting ALT+TAB once right after you minimize the game.
You can also try hitting CTRL + Escape once the game is minimized to bring up your start menu which should bring your desktop to the front.
Hope that helps!
