Problem with select first category when I used shortcode [mp_dropdown_categories]

I have used shortcode [mp_dropdown_categories show_count="1" hierarchical="1" orderby="title"] but I have not select first category form my dropdown list. Usually, first of dropdown category list is phase "select category", but such phrases is not.

screenshot http://screencast.com/t/yxMBmrOP

my site - http://olimp-dental.ru/buyfun/

Thank you,
Denis