Those files are what you downloaded using that wget
command. wget
queries a url and saves the response as a file. You asked it to. If, as typical for usage within a cron job, you are not interested in the response you must tell the system to ignore the response, to throw it away:
*/5 * * * * wget --post-data="pass=1123&Type=111" http://test.biz/index.php/game_line 2>&1 1>/dev/null