When skills are added to or removed from the course, your Crown levels might change. For example, new skills will show up as incomplete, and removed skills might reduce your total number of crowns.
But why does my tree look different today?
We work constantly to improve the courses and your learning of a new language. This means that your course could look different compared to a friend's, or compared to yesterday. You will notice that sometimes we add new words, combine skills, tweak sentences, and make entirely new sections, testing it all to make sure that you are getting the best possible content from us, and that your language skills get better and better with each practice. So if a skill looks decayed, it probably means there is new content added for you to practice!