Usual Render Issue

Hi guys,
Im having an issue in Unity, I made my animation in 3d Studio max, when I import fbx file into unity, some of thing acts weird than usual. in max, my object are soo proper, but in unity it is like coming from moon,
here is my issue,
Character hold a rock and change the linked object hand by hand..
the thing is when I export my animation to unity, Rock moves somewhere else.
https://www.kureselsiyaset.org