menu issue on mobile devices

Hi,

been testing my website on tablet and smart phone. found one issue that I cannot seem to fix.
When on a mobile device, the menu is to big to be displayed: so it will 'transform' into a button. When pressing the button the menu should become visible as a pull down menu.
It works for all menu's on mu web page except for the menus that clblog creates: they transform in a button, but clicking the button does 'nothing'?

here is a link to my live site, if you scale the page you will see the issue > http://www.lerendeleiders.nl/blog-overzicht
I have also attached a screen shot of the menu button.

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