The default WordPress way of showing categories on edit screens in wp-admin is to show the checked categories on top. If you have multiple hierarchical categories this can be annoying, especially if you use custom taxonomies. A while back I created a custom taxonomy that shows countries > regions > cities. Checked cities ended up on top. Very annoying.
See what I mean? The box on the right is what I want.
Direct download from WordPress plugin repository: Category Checklist Tree plugin