Changing user role to Instructor

I have installed a demo of LMS and am customizing it.  

1. When I visit the demo page All Instructors - https://tumblesafe.com/all-instructors/, it shows me even the site admins as Instructors. But when I try to add the Instructors on my About page by adding Member Carousels/Rotating Blocks module and select to show Instructors, the page does not show the admins anymore.

So I created a new user as Instructor and then it showed on the About page. But when I changed his role to Administrator in the user settings then it disappeared from the About page. I also changed his Forum role to Keymaster. Then I changed his role back to Instructor but it still does not show on the About page. Also, when I try to change the user's Forum role to Moderator instead of Keymaster from the All Users page, it does not change. But it changes when I enter the individual user setting and change from there. Is this happening because of bugs in the code? How can I have the user as site administrator, forum keymaster and instructor - and still show up on the Member Carousels module on the About page? EDIT: I just noticed on the individual user setting Role drop down menu, that Instructor choice is there twice. Why is that? When I used the other Instructor choice than the one I had, it shows up on the About page. How can I remove the extra roles which I don't need? Do I really need these roles in LMS - Shop Manager, Customer, LMS Manager?