You can remove only roles inherited by the current role

We were trying to mimic the Seeded Collections Manager Role, we copied the role and created the custom role using Copy Top Role and we could see that, in the role Hierarchy, Manage user Related were automatically assigned. We wanted the users not to get the access to the Manage Users Page.

When I am trying to delete it, I am encountering the following error message

"You can remove only roles inherited by the current role"

I am getting this message for all the rows, with Inherited by Role Name " Resource Administration " and " Manage Users " . Kindly assist me in deleting these.