[Plugin: Members] remove_users must be enabled in order to Edit custom post type?

Sort of an odd issue? I created a custom post type that I only want users with a specific role to be able to access. Created some custom capabilities and assigned them to both the admin and custom role. The admin had no problem editing these types of posts, but the custom role was unable to. I used the process-of-elimination to figure out that by checking / enabling the “remove_users” capability, the custom role could edit the custom post types.

Anybody have any idea why this might be? I was looking through the WordPress documentation but couldn’t find anything.

PS: I’m new to Roles & Capabilities and am still learning what each role / capability can do.

http://wordpress.org/extend/plugins/members/