Lessons offline not updating
I've seen this bug a few times now - lessons completed offline do not fully update (duolingo usually forgets the last one or two lessons completed) when I get back online
Yesterday I regretted hitting the continue button after completing the last question in a less right as I was walking into a tunnel that connected my train platform to the the station. I had no connectivity for 30 seconds and that happened to be just the wrong time to complete the lesson -- today I see I need to redo it. I try to be careful of this when I go into an elevator as well. It's frustrating...