(fixed gifs)multiple meshes are out of place when import to unity


I export the blender animation of 2 meshes, control by a single armature and export the FBX to unity. Here is what I got:

Please go to this link for the gifs:

the upper picture:
in blender,
the handle of the weapon is in correct position

the lower picture:
In unity,
the handle is oscillating

Could anyone tell me why? Thanks in advance.

No useful info supplied !!

sorry for that.
I have re-uploaded the gifs. Can u see it now?