@Marcel_merged May I ask why you have so many outdated variables in conf_global 🙂? IPS supports only:
return array( 'sql_host', 'sql_database', 'sql_user', 'sql_pass', 'sql_port', 'sql_socket', 'sql_tbl_prefix', 'sql_utf8mb4', 'board_start', 'installed', 'base_url', 'guest_group', 'member_group', 'admin_group' );