I am consistently being given the same problem multiple times. In particular this happens when being given a selection of pictures to choose a translation. I have seen the same question up to three times in a a row.
Currently this is happening to me in German. I have not done any other exercises in a while.
I wonder if this is related to the multiple voices because often (but not always) the same question is repeated with the other voice.
If it's the same thing that was happening to me, I think it might be a glitch. Ever since I started French - my whole streak - whenever I did "strengthen skills", the first half would be whatever word was weakest and then the second half would literally just be "Merci pour votre cadeau" over and over and over and over again. So I stopped doing "strengthen skills" because it was annoying and just did one skill at a time. Then just last Wednesday, the skill that the word "cadeau" was in faded out (as if I hadn't done it - which was odd, because I have my golden owl), I did the whole skill again, and it's been normal ever since.
So I say ignore it and it might go away. :)
I have had to stop my daily German lessons because of this problem with the program. I can't get past the phrase that the program keeps repeating and it will not let me proceed to the next lesson. For two days I've tried to finish lesson 5 of 6 in the travel section with no success.
I'm sad to have to stop my studies, but there is nothing else that I can do - unless someone in Duolingo wakes up and fixes the program