Follow these steps to retrace the issue;
1. Fresh WP Installation
2. Install members
3. Create a new user role say super_user
4. Turn on hierarchy.
5. Assign super_user role position:120
6. Create a new user with role super_user
7. Log in as that user.
8. Go to members > roles and both roles would be editable administrator and super_user
9. Now install and activate WooCommerce
10. Go to members > roles – Administrator is not editable anymore.
How ever it does display administrator is not editable because some plugin might ……..
So is there no way to override it for a higher position user
