Preselection not working for dropdown

[eluser]zulubanslee[/eluser]
I have a dropdown and here is the code

Code:

echo form_dropdown('selectcategory', $category_array, $selected_category);

$selected_category is outputting the variable I want, the html looks like it should, but the page always loads with the first item selected.

Here is the html
http://imgur.com/mbiNR