"Long time no see! How are you doing?"
There is no consistency in the questions throughout the levels of this group. The previous question wanted 最近怎么样 instead of 你怎么样.
it should be! even the hint if you hover over it shows ni hao ma. but then you type it and it marks it wrong :(
I think there's a disparity for those using a Chinese keyboard, wherein you can type whatever characters you want. Without a Chinese keyboard enabled, you have to choose from a given set of characters on the screen. In this instance, 'ni hao ma' is not an option, but 'ni zemme yang' is an option. So, maybe the system is looking for that answer exclusively. I don't know why the answer would or wouldn't be an accepted translation, I just mean that's a possible identification of the problem.