Wrong user with currentUser() on prod

I'm getting the name of my user that I load from the profile. It's works fine on my local, but on my prod, the firstname displayed is showing the name from the previous user. How do I prevent that ? This is how I get my data.

This is where I don't understand, I'm loading data by current user, but the user isn't the good one...

I have my "new" firstname only after clearing my website cache with drush

/**
 * Implements hook_preprocess_HOOK().
 */
function frr_menu_link_preprocess_menu__account(&$variables)
{
    $current_user = \Drupal::currentUser();
    $variables['firstname'] = FALSE;
    if($current_user->isAuthenticated()) {
        $entity_manager = \Drupal::entityTypeManager();
        $profileStorage = $entity_manager->getStorage('profile');
        $profileCustomerFound = $profileStorage->loadByProperties([
            'uid' => $current_user->id(),
            'type' => 'customer',
            'is_default' => 1,
            'status' => 1,
        ]);
        if($profileCustomerFound > 0) {
            $customer = end($profileCustomerFound);
            $firstname = $customer->get('field_firstname')->value;
            $variables['firstname'] = !empty($firstname) ? ucfirst($firstname) : FALSE;
        }
    }
}