With the release of the new topbar yesterday, I think I know why this happens. Basicly they moved the backpack, emotes, and leaderboard button into a new menu that is near the top right corner of the screen. Before, you had to open/close the backpack by just pressing one button. Now, you have to press one button, and another button to open/close the backpack because of this new menu, which can be very annoying. So I bet they made it to where when you click outside the backpack window it closes so you dont have to click 2 buttons just to close it.
In other words, I think they may be responsible for this bug, and may have made it a permanent feature so its easier to close the backpack. Not sure if this is indeed true, but im guessing it might be.
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