pagination links add add_args twice

Lookie here
https://dev24.cleverogre.com/join-the-chamber/member-information/membership-listings/?listing_cat=97

now click pagination twice.
I get ?listing_cat=97&is_paged=Y

#038;is_paged=Y this portion should not be there. this only happnes when there is a get variable present.

Any ideas??