buttons are not clickable on custom post types

i am using a custom post type called "downloads" using easy digital downloads plugin. and that custom post type is shown in PWAL settings and i have enabled it (both check boxes) and i have inserted PWAL buttons as u can see here..

http://www.designoptimal.com/project-file-downloads/create-cool-colorful-logo-adobe-illustrator-project-file-download/

but those buttons are not clickable and not function at all.

please let me know how to solve this thing...