Well, that's one way to see it, MugodaSimo :)
However, I think that is what the "practice/strengthening" button is for. Then you get questions from different lessons at random. Quite a challenge!
Here, I think they should present words that belong in the noun class they are teaching you. So they should keep this one in the M/Mi lesson and remove it from this N/N lesson. It's probably just a simple mistake that it ended up here.