1. Click the "select all" button. You select, for example, 3/3 monsters.
2. Click the "buy" button.
3. Close the purchase window, and voila - you have 4 monsters instead of 3.
At the moment of purchase, there's some kind of flickering, similar to when you click "refresh" on the desktop. That is, it's as if it wasn't there, but your eyes caught something unusual.
