Weird problem while trying to add functionality to Members Directory plugin

[Cojba]

Hello everybody!

I'm trying to edit Members Directory plugin so it shows user role along with website, name and bio.

Code:

Get user id:
$user_idd = $user_details->ID;

Get role of that user:
$user_current = new WP_User( $user_idd );
$role_container = $user_current->roles;

Display user role:
$content .= '<strong>' . __('Rank') . '</strong>: ' . $role_container[0] . '<br />';

Problem:

For some reason this code works only if the user is administrator. So, if user is administrator, then this code is creating line: "Rank: administrator". But, if user have any other rank, then $role_administrator is an empty string so I get: "Rank: ".

At first, I thought that the code placement is wrong, but I've tried to print $user_idd instead of $role_container[0], and I'm getting expected output(different id printed on different profiles).

Also weird - While desperately searching for solution, I've even tried to get user level(which is deprecated) instead of user role - and I'm getting the same problem - user level displays only for administrator :S

Any ideas ?

*Note - Source says that this is a free software under the GNU licence, so I can add the code of the whole plugin here if that helps.

Thank you.