Custom post type & role issues

I am having issues with using custom post types and custom user roles. I created a custom post type called Businesses. Then I created capabilities for users of a certain type to be able to add and edit business listings. The problem I am having is when I create the user type and add the capabilities of edit_business, edit_businesses, read_business, publish_businesses, the user has the ability to edit other peoples businesses. I can’t figure out why this is happening.

A snippet of the code I used to create the capabilities is:
'capabilities' => array( 'edit_post' => 'edit_business', 'edit_posts' => 'edit_business', 'edit_others_posts' => 'edit_others_businesses', 'publish_posts' => 'publish_businesses', 'read_post' => 'read_business', 'read_private_posts' => 'read_private_businesses', 'delete_post' => 'delete_business' )

Any help understanding this would be appreciated