"What kinds are you looking for, small ones or tall ones?"
Translation:Te milyeneket keresel, kicsiket vagy magasakat?
That's a technical issue. The machine takes the full sentence "Milyeneket keresel.." and adds the pronoun in front of it, because that's correct as well, but the capital in milyeneket still remains. Of course this is not the correct capitalisation there, but the issue is negligible, I'd say.
I am assuming that if the person who wrote the question wanted us to answer alacsonyakat, he/she would have written "short ones". Since he/she wrote small ones, the correct answer is "kicsiket". No ambiguity here. Duololingo should accept kicsiket and reject alacsonyakat. No more guessing please.
Actually I noticed this morning that there are two separate questions: one asking a translation from English to Hungarian, with small ones in English and one from Hungarian to English with alacsonyakat in Hungarian. My comment concerned the English sentence where small wrongly required alacsonyakat, and rejected kicsiket in duolingo. This should clarify my comment.