Some skills won't strengthen?

For the most part Duolingo is working fine for me on several languages. However, I have one skill that always seems to be skipped when I use the general "Strengthen Skills" button. Even if I go into that skill and use the "Strengthen" button from there, and use it several times getting perfect or near-perfect scores, the skill never shows as strengthened. Right now the only place I am noticing the problem is Dutch from English, the skill called Te + Inf. I have noticed it other place before, but they have started working again. Is there anything I can do to move it along when it seems stuck like this?

March 22, 2016


Got the same problem with Reflexives in Russian

March 23, 2016

I am testing out of skills and they are not showing as completed. Still shows 0 (zero)

March 24, 2016

I have the same problem with Spanish. I do the practice for each individual skill but the skill is not strengthened . It's only for some skills.

March 26, 2016

Try strengthening the lessons individually.

March 22, 2016

I tried redoing each of the lessons, starting with the last lesson just in case, and after redoing four of the five lessons, the skill showed as strengthened. Hopefully it will work as normal going forward. Thanks!

March 23, 2016

*the last lesson of a skill is sufficient to solve the problem as far as I know.

March 23, 2016

It happens to me all the time with English - Italian, after 3 or 4 strengthen exercises using the strengthen button of a skill. The problem solves when I switch from Notebook (Chrome) to the App on the iPhone. Sometimes I solved the problem by logging out and in. It must be a bug.

March 29, 2016

This is happening to me in Spanish. Apparently it does not strengthen the newest skills I've acquired.

September 5, 2017
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