Bug with arranging by Post Title

I have an issue that I can’t seem to resolve.

I am trying to arrange my posts by title, but in the front(and back) end the posts are in order for SOME of it, and NOT in other parts. I am completely lost. It’s a custom post type, but that shouldn’t really change anything (I think)

New items added arn’t in alphabetical order even if their titles are, but sometimes if I create a new post, and have copied the title from another post, it will be in order.

The site is here:
http://rowntreeantiques.com/inventory/

for the front end I am using

query_posts(array(
	'orderby' => 'title',
	'order' => 'DESC',
	'post_type' => 'portfolio',
	'showposts' => -1,

	));

Confused… 🙂

Thanks in advance, any help or ideas would be appreciated