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Bars keep changing

I've gone through the first 26 categories of my language more than once. Why? Because even though Duolingo says I've achieved 4 bars in that category like Adverbs, I suddenly go onto my iPad and see that it shows 2 bars or even 1. This happens almost every time or every other time I open the app. The "scores" or whatever do not stay fixed even if I've done a category more than once. Does anyone else have this problem?

2 years ago