me and davio found your bug
Its because you have two mouse and keyboards, one on the second layout, and one thats on the first which is a global one.
its always using the one on the first even if you delete the one on the second, but if your on the second level it will register 2 clicks because there are 2 mouseand keyboards being used, delete the mouse and keyboard in your second level and things should work fine, or remove global from the first.
its not a bug.