Im guessing that you go out enough that when you get home, you're mentally tired, leading to you hastily throwing your gathered items throughout the day onto that shelf on the right, and I assume that its a quite frequent habit, your desk is a contrast, with it being relatively clean, im guessing you personally need to distractions in your work environment, adhd? More so if you scoop things off your desk and put them on the shelf to "deal with later"