Sort does not work

Sort does not seem to work.

I have noticed something though and maybe someone can tell me how to correct it.

Let’s say my listing page is http://www.mydomain.com/featured-homes/

When I try to sort, it goes to http://www.mydomain.com/order=listing_price_num+DESC&ps=0&pe=10 which is a blank page.

It should be going to http://www.mydomain.com/featured-homes?order=listing_price_num+DESC&ps=0&pe=10 If I go there manually I can see the results of the sort.

Why is it leaving “featured-homes” out of the link when I try to sort — any ideas?

http://ww.wp.xz.cn/extend/plugins/fs-real-estate-plugin/