は from what I have been taught is voiced as ha unless it is being used as a particle, where it is voiced as wa.
I have noticed that DuoLingo always voices は as wa.
Was I originally taught wrong or is this an issue with Duolingo?
I was also taught that it was sometimes pronounced wa as a particle and in some words and pronounced ha in other words. I believe that, because Japanese is in beta and because it isn't the most popular language to learn, that they don't have the best of the best working on it and that there will be some bugs in it. I have found about three already; luckily they weren't the biggest mistakes.