My first language on duolingo is german. I decided to finish the english course and switched to it(I speak portuguese). Now whenever I'm doing english exercises I can't see my german yellow star on my profile! Why?
I think that it is to prevent "cheating". They probably think that it would be unfair to users who genuinely learn a language if there were people who just score points with their native language. Maybe things will change when more languages become available and when more people have the chance to study in their own language, but I don't have a problem with the way it works now.