Same question repeats 20 times

For the second time now, the same question repeated 20 times in the lesson. The lesson was #4 in Verbs 1 in Part 6 of the 156-skill French from English tree.

They are going to order the pizza.

The imgur link of a screenshot I took of the lesson review won't show as a picture, but you can see it here:


As a programmer, I can make an educated guess about what is happening. Rather than being fetched one by one, Duo question sets are downloaded before the lesson and cached locally for the duration of the lesson. I know this because one time, when power went out in the middle of the set, I was able to complete the lesson on backup power without Internet access and realized that the power was out only when sending the results back to Duo failed.

The repeating questions bug could happen if, for whatever reason, not all intended questions are downloaded before the lesson start. The programmers should set a flag that will not allow the lesson to start until the set of questions is completely downloaded to the user's local cache. It seems that presently this condition is not checked properly, allowing the lesson to begin with very few questions in the pool.

I am now submitting a bug report.

January 31, 2019


It's happened to many of us. I assume it's a glitch or bug. I haven't heard an official explanation for it yet.

January 31, 2019

Random does not mean equally distributed

January 31, 2019

Thank you for your insight.

February 4, 2019

Duolingo screenshot question repeat 20 times in a lesson

February 1, 2019


do you also run into this bug when you use the web portal?

Even web users nowadays have the problem that a single word or sentence is being repeated 4-6+ times in a single learning/reviewing session!

February 1, 2019

I use the web version exclusively, in Edge. Well, I have used the mobile version once, to push through a lesson I was stuck on because of a bug.

What you are describing happens very frequently. For me, approximately one lesson out of five bugs out near the end with such repetitions. The repeats come last in the lesson, which seems to confirm it is an issue with the local cache not having enough questions. If the problem exists for mobile version users as well, then the issue is probably not client-side. Most likely the question set is sent incomplete by the server.

Could you kindly tell me the codes for embedding an image? I tried several ways, following instructions posted by users, but to no avail so far.

February 2, 2019

Yep! I use the web exclusively and I've run into a couple lessons that were all the same sentence. Back and forth from Spanish to English, over and over, LOL.

February 2, 2019
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