[SOLVED] Issue with Hierarchical Pages plugin

Hi,

As of recently, whenever I click on a menu item (page) in any of the menu widgets that I have, the child and parent pages open not only within that menu widget (which is what they should do) but in all menu widgets. I disabled all plugins but that did not help. I know I tinkered with the PageNavi plugin but I deleted that one altogether. Other than that I don't remember doing anything major except for upgrading to the new WP version, 3.7.

I left a support request on the plugin support page but have not received a response. I know this is is not an Atahualpa problem per se but you guys always provide such great support; would you care to take a quick look, and click on any of the menu items in the left hand bar (skip the top two as they don't have child pages)? The address is http://www.cornetsdegroot.com/
I appreciate!

Best,
Rutger