Thanks for playing!
To complete a level, you need to get the correct percentage and also complete the loop.
The screenshot you have sent here shows that you did not finish the loop, which means you must have stopped moving at some point in the game or let go of the tread button. You can see when a loop has failed at the top of your screen during gameplay.
If you didn't do either of those, it might have been a bug I haven't caught. Is there a specific case where this occurs that you can replicate?