could u elaborate whats the bug so that i could check?
At least on the browser version if you drag a tower out and select another, without placing the first, the one you dragged out will stay in the window and activate during the defence. It costs nothing but you need the money to drag one out in the first place. So in one attempt I had a bunch of towers on the left edge of the defence window, which cost me nothing but still worked and it makes you very op, especially with the sideward shooting towers