The internals of that puzzle are bandaged. You need 6 internal pieces to sort that issue out. Here is a video by Super Antonio Vivaldi that shows how to: https://www.youtube.com/watch?v=ZOGEGq04Ia8
He also has a video showing how to solve the puzzle with the bandaging in: https://www.youtube.com/watch?v=656jsdYmjDg
You might want to contact Calvin from HKNowstore and see if he wishes to sell you the pieces you need.