Drop down menus go behind user list

Hi, i just wanted to test your plugin, the idea and the design for the first version is great but, as expected, problems are out there.

please go to

http://sansapentrusansa.org/membri-de-onoare/#.UYQ3ibVhiSp

And check this out, the drop down menu goes behind the list of user, their avatars, and cannot be seen.

http://wordpress.org/extend/plugins/buddypress-featured-members/