I would like to give some feedback about ... When I solve the flat dictionary, it says task solved in the banner pic but below is written: ' "The Flat Dictionary" task doesn't accept solutions '

It seems to have accepted my solution and shows I have cleared the problem but I can't view any other solutions. Has it never accepted any solutions or something?

From: https://checkio.org/mission/flatten-dict/solve/

HTTP_USER_AGENT:

Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:45.0) Gecko/20100101 Firefox/45.0