sadly i am not that good with JS to find out what is wrong I am trying like it says on this page
http://isotope.metafizzy.co/demos/hash-history.html#filter=*&sortAscending=true
If i click on the first filter the result is ok but as soon as i select another filter the filter before gets removed by the 2nd.
Please see my Fiddle here:
http://jsfiddle.net/5Quw8/
With best regards, Mike
You simply forgot the <div id="options">
bit.