wpdb giving different results then query in SQL Editor

I’m trying to read candidates and the relation with expertises from 2 custom tables in my WP Database.

This is my WPDB query :

$candidates = $wpdb->get_results("
   SELECT * 
   FROM wp_bullhorn_candidates
   INNER JOIN wp_bullhorn_candidates_expertise
   ON wp_bullhorn_candidates.id = wp_bullhorn_candidates_expertise.candidate_id
   WHERE wp_bullhorn_candidates.inserted = 0
   OR wp_bullhorn_candidates.changed = 1
   GROUP BY wp_bullhorn_candidates.id;
");

This is an example of an object in my array:

[3] => stdClass Object
    (
        [id] => 7
        [firstname] => azaeezeza
        [lastname] => bbb
        [email] => azerty@qwerty.com
        [current_job_title] => zezaezaeaz
        [jobtype] => Open for both
        [location] => West-Vlaanderen
        [experience] => 3-5
        [receive_vacancies] => 
        [inserted] => 0
        [changed] => 0
        [bullhorn_id] => 1123222
        [candidate_id] => 4
    )

As you can see is the id not equel to the candidate_id … . Wen I run this query in my SQL Editor on the same DB (Sequel Pro in my case) I get perfect results … .

An example of result in Sequel Pro:

How is it possible the same query is giving different results?

I also tried to print the errors but my array was empty so no errors.