Ds 20 Sailboat I've Completed HP And The Order Of The Phoenix On Nintendo DS But It Says Only 20% Has Been Completed?

I've completed HP and the order of the phoenix on nintendo DS but it says only 20% has been completed? - ds 20 sailboat

I worked in the game and disadvantages of dual-Death Eaters and Lord Voldemort, and saw the last part where Harry says: "Theres something Voldemort does not, etc. .." but he always says he has completed only 20%.
This is not usual on the screen.