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 not seen that it is limited to being when lessons are extended.
I was inspired to write this post when I started a new skill with repeats of 2, 2, 3, 2, before it gave me a unique problem.
"Mein Ratgeber ist neu". I have restarted a lesson in which this phrase appears four times. It hits this deadly phrase and repeats it until I stop the lesson. Isn't there any anyone in dueling monitoring and solving problems?
I have the same problem for my French lessons: the same sentences appear at least fifteen times in a row.
Maddening isn't it. Finishing my Danish tree was a trial because I had to type in HC Anderson is Hans Christian Anderson at least fifteen times:(
Hopefully this will get fixed at some point. I get the impression it happens when you extend the number of questions in the lesson by typos or other mistakes and they are padding the lesson to make you pay for the errors.
This seems to be a often discussed issue. I get a lot of repetition in Italian strengethening. Sometimes a single phrase.But with ne skills luckily not so far.
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