Simple Ads changes my banners and renders them useless

Simple Ads changes my banner codes from:
scripts/banner.php?ref=[logged_user_username] & a m p ; a_bid=


scripts/banner.php?ref=[logged_user_username] & a_bid=

I had to add ( & a m p ; ) to account for wordpress auto fixing the ampersand during display. Now Simple Ads plugin changes it back automatically after I save the plugin setting, and as a result, wordpress will not display my banner.

Is there a way to edit or add a function to stop Simple Ads from doing this?