Published Report won't allow for column sorting

Published Report won't allow for column sorting

I've published a Zoho Report pivot table to the web.  With the exception of the first column, no other column is sortable.  The sort arrows appear, but they don't work.

I'm sure I've done something wrong, but I can't figure it out.

Can someone please advise?

You can see the published Report here:

http://www.aprilmassie.com/test.htm