Improper validation check

I would like to give some feedback about ...

From: https://checkio.org/mission/most-wanted-letter/solve/

HTTP_USER_AGENT:

Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_6) AppleWebKit/601.7.7 (KHTML, like Gecko) Version/9.1.2 Safari/601.7.7

I am able to find proper result in output pane but while click on check and solve it shows me diff result that task failed. please check