I have similar behavior in a joomla site using responsive bootstrap CSS. It involves use of the CSS media tag which is a css meta selector based on screen width (invisible to Firebug as far as I could work out). It turns off display of the block containing the menu using CSS properties; I changed the CSS to stop that (I allow it for the narrowest width). I think the button’s toggle behavior is controlled by JavaScript but I didn't investigate once I stopped the menu hiding.
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