New skills registering or not?
I run classes where we do Duolingo once a week. I reward the children based on a simple formula of a score based on (lessons x XPs x skills) which of course means that if they fail to attain a new skill, their score will be zero. However some children do attain a new skill for the first time (I can see this on their log) and it does not register. It seems rather hit and miss. Can anybody explain this to me, surely there's a simple algorithm governing whether they have or they haven't?