Map not updating when user selects a 'category'

Hello

When a user calls up the directory and selects one of the categories from the links above the map, I would expect the map to update and it doesn’t.

Steps to reproduce:

http://advicerichmond.org.uk/directory/
(you need to use artc2014 as the password to access until it is live)

Click any of the blue links above the map to narrow your search, e.g. housing, so you’ll now be on:
http://advicerichmond.org.uk/directory/housing/

I would expect the map key to only have housing ticked now and only the housing icons to be shown up.

It feels confusing from a user point of view otherwise.

I’m using Firefox on a Mac, but the same happens in IE8,9 and 10.