In my LimeSurvey installation (6.16.2), when I create surveys, the URLs linking to the survey are wrong.
I have seen this in several places:

• Emails
• Link to the survey in the UI
• QR codes

For example, if my limesurvey-site is limesurvey.example.com, the links look like this:

https://limesurvey.example.comhttps://limesurvey.example.com/index.php/xxyyzz?lang=de-informal

After removing the first part (https://limesurvey.example.com), the link works. However, when sending out Emails or giving away QR codes, this prevents users from taking the survey.

Details for my installation:

• docker based installation (using martialblog/limesurvey:6-apache from 2025-12-26)
• traefik is used as a reverse proxy

config.php:

<?php if (!defined('BASEPATH')) exit('No direct script access allowed');
return array(
  'components' => array(
    'db' => array(
      'connectionString' => 'mysql:host=lime-db;port=3306;dbname=limesurvey;',
      'emulatePrepare' => true,
      'username' => 'limesurvey',
      'password' => 'xxxxxxxxxf',
      'charset' => 'utf8mb4',
      'tablePrefix' => 'lime_',
    ),
    //'session' => array (
    //   'class' => 'application.core.web.DbHttpSession',
    //   'connectionID' => 'db',
    //   'sessionTableName' => '{{sessions}}',
    //),
    'urlManager' => array(
      'urlFormat' => 'path',
      'rules' => array(),
      'showScriptName' => true,
    ),
    'request' => array(
      'baseUrl' => 'https://limesurvey.example.com',
     ),
  ),
  'config'=>array(
    'publicurl'=>'https://limesurvey.example.com',
    'debug'=>0,
    'debugsql'=>0,
    'mysqlEngine' => 'MyISAM',
  )
);