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OffCanvas menu and Dropdown conflict

I'm using an offset canvas and a dropdown button. The later brakes the menu making it disappear. I tried sticky menus and removing everything but this two elements and still brakes it.

Here is the (not) working example: http://linknow.co/miguel/temp/four.php

Button shouldn't move it up in the screen...

offcanvasmenudropdown

I'm using an offset canvas and a dropdown button. The later brakes the menu making it disappear. I tried sticky menus and removing everything but this two elements and still brakes it.

Here is the (not) working example: http://linknow.co/miguel/temp/four.php

Button shouldn't move it up in the screen...