I am stuck on the 3rd level 'skate to victory'.. it says 0% after I complete it. I got the key after jumping off the boot and the key down by the skateboarding place.. i finish the level but it still says 0% after and I have nothing/nowhere new to go.. help?

I got 100% on level 1 and 30something% on level 2.. but level 3 skate to victory says 0% even after I complete it and get a bunch of stickers, etc..

help?