There is a special protection of ‘Administrator’ role and users with ‘Administrator’ role from editing by user with other role. It’s active by default.
This filter ure_supress_administrators_protection
allows to switch of this protection.
Usage example:
add_filter('ure_supress_administrators_protection', 'my_supress ure_administrators_protection', 10, 1);
function my_supress ure_administrators_protection($supress) {
return true;
}