I don't know where to contact someone about this, that's why i posted it as a discussion topic, i know it's not that bad, because it's only a week streak, but it's still frustrating...
If you stay one day without fulfilling your daily goal, I guess you go back to 0 in your day streak :/
Or if you start the lesson late at night, so you don't accomplish your goal by midnight, it doesn't count towards that day.
Streak freezes are handy to have around.
Ok :(( Thank you both for answering, i think it was the daily goal thing what interrupted my streak :/