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Three hearts in "strengthen skill" but progress bar doesn't move?

I've recently gone back to using duolingo after letting it sit for awhile, so many of my skills only have one or two filled bits of the progress bar. However, when I go back and strengthen them and I maintain all three hearts during the lesson, the progress bar doesn't move. Then I go back and get one or two or even zero hearts and it fills up! What gives?

January 9, 2014


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