I have finished my tree twice and each day I refresh the 3 or 4 or 5 sections to keep it gold. Today 15 sections appeared in color, some of which I just did over a few days ago.
Why are so many sections appearing in one day?
Clearly this is a bug in the program, and lots of people are seeing it. No one seems quite sure how to get DL's attention.
i don;t know, but the same thing has been happening to me. Try refreshing the earliest lessons, which might strengthen some of the higher ones simultaneously.
I've kept the tree gold since I completed it the first and second times. But, this still happened. S