I created a simple character animation in iClone that looks like this:



However, when I export this character using 3dxchange to Unity an preview animation, the fingers of the character are distorted. Here is how it looks in Unity:



As you can see in the above picture, the fingers of the character, especially the thumb, index and middle finger, are not the same to those in the iClone.
How can I solve this issue? What are the possible causes?
Thanks in advance.